Original Research ARTICLE
The Chinese EPOCH Measure of Adolescent Wellbeing: Further Testing of the Psychometrics of the Measure
- 1Department of Psychology, Tsinghua University, Beijing, China
- 2Melbourne Graduate School of Education, The University of Melbourne, Melbourne, VIC, Australia
Given the enormous population of Chinese-speaking people worldwide, it is important to establish measures of adolescent wellbeing with adequate evidence for reliability and validity. The EPOCH Measure of Adolescent Wellbeing assesses five positive psychological characteristics (engagement, perseverance, optimism, connectedness, and happiness). An initial study with the English version of the measure found support for a five-factor structure, and evidence for internal reliability, convergence with other wellbeing measures, and divergence across factors and with unrelated constructs. An initial study translated the measure into Chinese and found support for the factor structure of the measure. To further test the measure’s psychometric properties, data were collected from 11 Chinese student samples (N = 17,854) from several regions of China. All students completed the EPOCH measure, along with a variety of other measures. In cases where measures overlapped, samples were combined, with relevant sub-sets used to examine convergent and divergent patterns. Confirmatory analyses supported the five-factor structure and factors were internally reliable, but consistency over time was low. The five factors were more strongly correlated with other wellbeing factors than with illbeing factors. While some correlations demonstrated expected convergent and divergent patterns with other constructs, there were also considerable deviations from expected patterns. Norm values specific to the Chinese version of the measure are provided. The study supports the EPOCH measure as a useful cross-sectional tool for measuring adolescent positive functioning, but additional consideration of cross time stability, change, and correlations with other constructs is needed.
The past decade has brought growing interest in and prioritization of youth wellbeing. Assessment of such efforts plays an important role in ensuring that such initiatives add value, providing not only activity, but also impact (White and Kern, 2018). To this end, various measures have been developed. The EPOCH Measure of Adolescent Wellbeing (Kern et al., 2016) is one such measure, capturing five positive psychological characteristics: engagement, perseverance, optimism, connectedness, happiness. A series of 10 studies with Australian and American respondents provided initial psychometric support for the measure. An initial study testing the Chinese version of the measure supported the factor structure of the measure, and also suggested that mean values are not directly comparable across cultures (Kern et al., 2018). The psychometric properties of the measure specifically within Chinese samples need to be further established. Addressing this need, the current study examines evidence for reliability and validity across 11 samples of Chinese adolescents and provides norm values specific to Chinese respondents.
Adolescent Positive Psychological Functioning
Most parents and teachers, when asked, will say they want their children to be happy (Seligman et al., 2009). Happiness might refer to having a sense of satisfaction, feelings of belonging at school, performing well at school, developing good social character, or a range of other positive aspects. It also means a lack of mental disorder, loneliness, disengagement, and other negative aspects. And yet around the world, mental illness causes considerable disability for young people, and suicide and accidents are the greatest cause of adolescent mortality (World Health Organization, 2017). Twenty to thirty percent of students in the United States are disengaged with learning (Gallup, 2014). Unfortunately, “many of the brightest and most innovative youth will not make it to adulthood or will enter adulthood crippled by chronic disorder” (White and Kern, 2018, p. 3). High rates of mental illness worldwide have spurred concern to find better ways to support young people – helping them to not only manage dysfunction, but also proactively develop positive psychological characteristics that support optimal youth development (Kern et al., 2017). A growing number of curricula and policies have thus been developed worldwide that prioritize youth wellbeing (International Positive Education Network [IPEN], 2017; Kern et al., 2017; Slemp et al., 2017).
Numerous definitions and models of wellbeing exist for both children and adults (Forgeard et al., 2011; Organisation for Economic Co-Operation and Development, 2013; Rose et al., 2017). For our purposes here, we focus on subjective aspects of functioning. Different wellbeing models include a variety of functional aspects. Adolescence is an important period where character, mindsets, attitudes, and skills are being developed that impact subsequent development and functioning. Thus, we focus here not on feelings of happiness, but rather on positive characteristics that support healthy psychosocial development.
Kern et al. (2016) suggested five positive psychological characteristics that support positive youth development: engagement, perseverance, optimism, connectedness, and happiness. Engagement is conceptualized as the capacity to become absorbed in and focused on what one is doing. Perseverance reflects working hard and the ability to keep striving toward one’s goals, despite encountering obstacles. Optimism reflects being hopeful and confident toward the future. Connectedness refers to having the ability to establish satisfying relationships with others, and believing that one is cared for, loved, esteemed, and valued. Happiness reflects having a generally positive mood and feeling content with one’s life.
The EPOCH Measure
To assess this theoretical model, Kern et al. (2016) developed a 20-item measure, with four items per domain. Through a series of 10 studies with over 4,000 adolescents from the United States and Australia, the authors tested and provided evidence for adequate psychometric properties of the measure. Analyses supported the five-factor structure and internal reliability of the factors, with Engagement being the least reliable factor and Happiness being the most reliable factor. Factors were relatively stable across a 3-week period, with cross-time correlations ranging from r = 0.55 to 0.71, with weaker correlations across more distal time points, especially in schools where intervention occurred. Convergent and divergent patterns indicated that the factors were unrelated to age and gender, strongly related to general wellbeing measures, moderately correlated with illbeing measures (e.g., symptoms of depression and anxiety), and differentially correlated with other positive constructs, depending on the factor.
As the measure was developed and tested across two Western cultures, an important question is the extent to which it is applicable to Eastern cultures. To this end, Kern et al. (2018) translated the measure into Chinese and tested the extent to which the measure was invariant across cultures. Comparing a sample of over 3,500 Chinese students with the Australian and US students included in the initial study, models demonstrated weak invariance, indicating support for the five-factor model across cultures, but lacked strong invariance, indicating that mean scores are not directly comparable across cultures. Thus, norm values specific to Chinese respondents are needed. In addition, as the study focused on comparing the factor structure across studies, it did not test internal and cross time reliability nor other aspects of validity, so further testing of the psychometric properties of the measure are needed.
The Current Study
Given the enormous population of Chinese-speaking people worldwide, it is important to establish measures of adolescent wellbeing with evidence for reliability and validity specifically within Chinese respondents. Replicating the initial study with the Chinese EPOCH measure, we first confirm the EPOCH factor model across 11 new Chinese samples, testing the expected five-factor model. We then test internal and cross-time reliability and consider associations with a variety of other constructs. Finally, we summarize descriptive information for the factors, which provides norm values for the measure.
To consider convergence and divergence with other constructs, we include a variety of measures. Combining the pattern of correlations evident in the original Kern et al. (2016) study and knowledge of characteristics of the Chinese culture, Table 1 summarizes our hypothesized pattern of correlations across the constructs available. First, as the EPOCH factors are positively correlated with one another, we expected a halo effect to occur, such that a positive or negative correlation with one factor would be reflected across the other factors, although with varying strength. Second, as Kern et al.’s (2018) analysis suggested that the Optimism and Happiness factors are more closely aligned with a general wellbeing factor than the other factors, we expected patterns to be similar for Happiness and Optimism, with greater divergence across the Engagement, Perseverance, and Connectedness factors. Relatedly, we expected that Optimism and Happiness would have the strongest associations with other wellbeing factors, with greater variability across the other factors.
Table 1. Hypothesized range of associations between the five EPOCH factors and other variables measured in one or more samples.
Third, we expected to replicate the pattern of results in the original study (Kern et al., 2016). Specifically, the authors found that the factors did not vary across age (r < 0.05). Females were slightly more likely to report higher levels of Connectedness (r = 0.09), and year level was weakly related with less Happiness (r = −0.06). Factors were more strongly correlated with other wellbeing factors than with illbeing factors. We thus expected minimal correlations with age and gender (with weak correlations of gender with Connectedness and Happiness with age), weak-to-moderate negative associations with indicators of psychological distress, and moderate-to-strong positive associations with indicators of wellbeing.
Fourth, we expected Connectedness to be most strongly correlated with relationship variables (teacher, parent, peer, classroom relationships), as theoretically, the ability to connect well with others fosters good relationships with others, and to also correlate with positive social skills (e.g., empathy). We expected that Perseverance, which studies find to be a strong predictor of academic achievement (Duckworth et al., 2007) and positive life, health, and career outcomes (Kern, 2017), would be most strongly correlated with school performance, work value, internalized self-regulation, grit, approach style toward learning, self-regulation, resilience, and coping. Finally, we expected Engagement to be most strongly correlated with school engagement.
Materials and Methods
Data were collected between August 2016 and April 2018. A survey link was sent to the school administrations of schools that had agreed to be a part of the study. The teachers of each participating class brought their students to their school computer rooms to complete the online survey. Before administering the survey, written consent was obtained from the school administration, teachers, parents, and students at the school. Participants were informed about the objectives of the study and assured that all responses would be kept confidential, only accessible to the research group and used for research purposes. All procedures were approved by the Human Research Ethics Committee at Tsinghua University.
Participants and Measures
Data came from 11 samples of adolescents from schools across several regions of China including Sichuan Province (Southwestern China), Tianjin City (Northern China), Hunan Province (Southern China), and Shanxi Province (Central China), resulting in a total sample of 17,854 individuals (9,548 male and 8,306 female).
The current analyses used existing data, which add several limits to what we could do in our analyses. To protect student privacy, students were not asked which school they attend. As most samples included two or more schools, we defined samples based on the set of scales completed, rather than based on the school that students attended. As schools managed the consent and administration process, it is unknown how many students within classes might have refused to participate. In addition, the system that was used to collect data only recorded complete responses, such that it is unknown how many students might have started the questionnaire and did not complete it.
All samples completed the 20-item Chinese version of the EPOCH Measure of Adolescent Wellbeing (Kern et al., 2018). Four items assessed each of the five domains on a 1–5 scale (1 = not at all like me, 5 = completely like me). To reduce participant burden while testing a broad array of correlates, students also completed several different scales, as summarized in Table 2 and detailed in Supplementary Appendix 1. In addition, several schools volunteered for their students to complete measures a second time, resulting in 5,459 students (2,827 male and 2,632 female) completing the EPOCH items again, between 3 and 16 months later.
In cases where measures overlapped, we combined samples and summarized results across participants, with relevant sub-sets included to examine convergent and divergent patterns. As data came from 11 diverse samples, this provides an integrative data analytic approach in which multiple samples are combined at the item level and analyzed together (Curran and Hussong, 2009; Kern et al., 2014a). As the lack of school identification meant that we were unable to directly test students nested within schools, we conducted analyses for the full sample (ignoring potential nesting effects), and across gender, school type (primary only, primary and secondary, vocational/technical), location (Sichuan Province, Tianjin City, Hunan Province, Shanxi Province), and area (urban or rural). While these analyses do not directly account for the nested structure of the data, it helps to clarify potential boundary conditions of our analyses. Analyses were conducted in R (version 3.4.2).
First, using confirmatory factor analysis (CFA), we evaluated the expected five-factor structure, using the lavaan (Rosseel, 2012) package. Replicating Kern et al. (2018), we used the Satorra–Bentler scaled test statistic (Satorra and Bentler, 1994) and the robust diagonally weighted least squares (DWLS), which uses the polychoric correlation matrix to estimate model parameters to account for the ordinal nature of items. We report the robust maximum-likelihood (ML) and robust DWLS estimates. We evaluated model fit with the Tucker–Lewis Index (TLI), comparative fit index (CFI), root mean square error of approximation (RMSEA) with its 95% confidence interval (CI), and the standardized root mean square residual, with adequate fit indicated by a RMSEA ≤ 0.06 combined with a SRMR ≤ 0.09 and a minimum TLI and CFI of 0.90 (Hu and Bentler, 1999). To test invariance for the sub-groups, we used the semTools package (Jorgensen et al., 2016), which compares increasingly constrained models to the configural model, and focused on change in CFI (ΔCFI). Following Cheung and Rensvold (2002), we considered ΔCFI < 0.01 as indication that the invariance assumption holds.
Second, we tested internal and cross-time consistency. Using the psych package (Revelle, 2016), we estimated four indicators of internal consistency: Cronbach’s α, Guttman’s λ6, and minimum and maximum split half reliabilities (β and λ4). Cross-time consistency was indicated by Pearson r correlation coefficients, tested on the subset of participants that completed the EPOCH items twice.
We then compared mean level differences across gender, school type, location, and area, using independent sample t-tests and ANOVA. Finally, we considered convergent and divergent patterns with other constructs, using Pearson r correlations for the combined subsets of participants that completed the various measures. With the very large sample size, we focus on the size of the effects rather than statistical significance, considering the extent to which effect size strengths aligned with our hypothesized pattern of results (Table 1).
Confirmatory analyses generally supported the five-factor structure. Robust ML estimation indicated good fit [2(160) = 8,934, CFI = 0.931, TLI = 0.919, RMSEA = 0.055 (CI = 0.055, 0.056), SRMR = 0.041]. Robust DWLS estimation suggested good fit according to RMSEA and SRMR indicators, with weaker fit according to CFI and TLI fit indices [2(160) = 10.273, CFI = 0.898, TLI = 0.879, RMSEA = 0.059 (CI = 0.059, 0.060), SRMR = 0.037]. Strict invariance was supported for gender and area, and strong invariance was supported for school type and location (see Supplementary Appendix 2), indicating that the five-factor model is sufficient and mean values are directly comparable across sub-groups.
Factors were internally reliable, but consistency over time was low, ranging from r = 0.12 to 0.21 (Table 3). As summarized in Supplementary Appendix 3, males reported higher levels of Engagement [t(17,852) = 3.21, p < 0.0001] and lower levels of Connectedness [t(17,852) = −9.71, p < 0.0001] than girls, with no significant differences for the other factors. Respondents from urban areas reported higher levels of all five factors than respondents from rural areas. Respondents from the Sichuan Province or Tianjin City reported higher levels of wellbeing than respondents from the Hunan and Shanxi Provinces. Samples that included both primary and secondary schools reported a higher level of each factor than samples that only included primary schools or vocational and technical schools.
We then examined associations with other constructs (Table 4). As expected, minimal associations occurred between the EPOCH factors and age and gender. The five factors were more strongly correlated with other wellbeing factors than with illbeing factors. Notably, correlations were weaker than we expected for anxiety and depression, but stronger than expected for many of the wellbeing constructs.
Engagement demonstrated the weakest correlations with other well-being constructs. Correlations matched our expectations for motivation, resilience, anxiety, teacher relationships, and school performance, and were much stronger than expected for coping, empathy, grit, mindset, self-awareness, and self-efficacy. Surprisingly, although Engagement was moderately correlated with school engagement (r = 0.29), this correlation was weaker than the correlations between school engagement and the other EPOCH factors.
Consistent with prior studies (e.g., Duckworth et al., 2007; Kern, 2017), Perseverance was strongly correlated with school performance, work value, internalized self-regulation, grit, an approach style toward learning, self-regulation, resilience, and coping. However, associations tended to be weaker than predicted, with the exception of empathy, self-awareness, and self-efficacy, which demonstrated strong correlations with Perseverance. Notably, Perseverance was more strongly correlated with internal forms of motivation and was unrelated to external motivation. Perseverance was also strongly correlated with school engagement and self-control, and was moderately correlated with coping, interpersonal skills, and physical health.
Optimism demonstrated much stronger correlations than we expected with coping, empathy, grit, internal and approach-oriented forms of motivation, self-awareness, self-efficacy, and work value, whereas correlations with resilience, school engagement, and teachers, classroom, and parent relationships were weaker than we expected. Connectedness demonstrated weaker correlations with teacher, peer, and parent relationships and was strongly correlated with interpersonal skills and class belonging/relationships. This suggests that Connectedness captures school belonging more than other forms of belonging. Happiness was strongly correlated with good relationships with teachers, peers, and parents, suggesting that relationships might be a key contributor to happiness. Happiness was strongly correlated with physical health, implying that health and happiness are mutually supportive. Happiness was also highly correlated with resilience and school engagement.
Finally, Table 5 provides descriptive information for each factor, for the full sample and separated by gender, school type, location, and area. As the five-factor model was adequate, factors had acceptable levels of internal reliability and (with some exceptions) followed expected correlational patterns with related and unrelated constructs. We included a large and diverse set of samples, and these values provide norm values that might be expected within Chinese students.
Table 5. EPOCH norm values, for the full combined sample, and by gender, school type, location, and area.
The past few decades have brought growing interest globally in individual and societal wellbeing. One-fifth of the world’s population – over 1.4 billion people – live in China (United Nations, 2017), and Chinese (all dialects) is the most spoken language in the world (Noack and Gamio, 2015). It can be questionable to compare self-reported Likert-style questionnaires across cultures (Heine et al., 2002). As such, having valid instruments of wellbeing with sound psychometrics and norms specific to Chinese populations is important.
The current study tested the Chinese version of the EPOCH Measure of Adolescent Well-Being (Kern et al., 2018) across 17,854 Chinese adolescents from 11 samples from urban and rural areas in the Northern, Southern, and Central parts of China. CFAs supported the five-factor structure of the measure, factors were internally consistent, and factors generally demonstrated expected convergent and divergent correlations with similar and dissimilar constructs. Our results further support the EPOCH measure as a useful tool for measuring adolescent positive functioning for Chinese adolescents, but also raise additional questions around the appropriate uses and applications of the measure.
While definitions and models of positive psychological functioning vary, most models include multiple domains and indicators (Forgeard et al., 2011; Friedman and Kern, 2014). Some recent studies have questioned whether wellbeing indeed comprises more than one dimension (e.g., Goodman et al., 2017). Our results add support for multidimensional models of student psychological functioning. Statistically, adequate to good fit for the five-factor model occurred, depending on the estimation approach and fit index. Happiness consistently demonstrated the strongest correlations, which may reflect a halo effect (i.e., when you feel good in one area, you also feel good across a range of other areas), or may be a result of the greater internal consistency of the factor items compared to the other factors.
While some constructs correlated strongly across the EPOCH factors, with little differentiation by domain (e.g., coping, empathy, approach motivation, physical health), other correlates demonstrated more differential patterns. For instance, Perseverance demonstrated stronger correlations than the other factors with grit, self-control, and school performance. Self-efficacy and self-awareness were most strongly correlated with Perseverance and Optimism. Connectedness demonstrated the strongest correlations with several relationship variables. Happiness demonstrated the strongest correlations with resilience and the absence of psychological symptoms. Still, the differences among these correlations were small (generally r < 0.10). All correlates were self-reported, which can add method variance and conflate correlational patterns. Alternatively, the measure may be inadequate for detecting specific differential patterns. Future studies might further test the convergent and divergent patterns, using a variety of assessment methods and specific correlates that ought to have divergent associations with each factor.
While the measure may be inadequate for identifying distinctive patterns of each factor, there can still be practical benefits of multidimensional wellbeing models (e.g., Kern et al., 2014b; McQuaid and Kern, 2017). By considering multiple dimensions of psychological functioning, it can identify areas of strength and weaknesses, informing more targeted interventions and programs to best support young people. An analogy can be seen with indicators of academic performance. Although grade point average provides an overall summary score of how a young person is performing, it provides little indication of which subjects a student is exceling or struggling with. The profile of marks across different subjects is more useful. The measure does provide a profile of responses across five domains, adding a greater picture of psychological functioning compared to when relying on a single overall wellbeing score alone.
The pattern of correlations with other constructs suggests that the five factors together provide an indication of students who are interested in learning (valuing work, motivated to learn) and have strong social and emotional skills (aware of themselves, empathetic toward others, self-controlled, coping well).
As expected, the EPOCH domains were minimally correlated with age and gender, and the model was invariant across gender and school type. The EPOCH domains were specifically chosen to be stable across development, such that scores reflect psychological functioning rather than maturation effects (Kern et al., 2016). The minimal correlations with age suggest that the factors are indeed capturing something more than developmental change, supporting the use of the measure across the adolescent years. Future studies might test the extent to which the measure can be used at younger or older ages. It also appears to be appropriate for both boys and girls.
Unexpectedly, although Engagement was correlated with school engagement, the effect sizes were weaker than for the other EPOCH dimensions. Engagement is a multidimensional dimension, defined in some models across cognitive, affective, and behavioral domains (Appleton et al., 2008), and in other models defined as vigor, absorption, and dedication (Upadyaya and Salmela-Aro, 2013). The two engagement measures appear to capture different concepts of engagement. The EPOCH Engagement items focus primarily on the cognitive domain, capturing elements of flow (e.g., absorption in tasks). Indeed, the factor was strongly correlated with internal, approach-oriented forms of motivation, self-awareness, and self-efficacy. In contrast, school engagement was most strongly correlated with Optimism and Perseverance, reflecting vigor and dedication.
Interestingly, Perseverance was strongly correlated with integrated regulation (i.e., the most internalized form of motivation), with weaker correlations for more externalized forms of regulation (identified, introjected, and external). The other factors similarly showed a decreasing correlational pattern from internalized to externalized forms of regulation. Self-determination theory suggests that more intrinsic forms of motivation support the satisfaction of basic needs for relatedness, autonomy, and competence, which in turn supports greater wellbeing (Ryan and Deci, 2000; Ryan and Deci, 2001). It may be that intrinsic forms of motivation help support the development of positive psychological characteristics, or that the EPOCH factors help enable basic needs to be fulfilled, subsequently resulting in greater wellbeing and better performance at school.
Although responses were spread across the distribution for each factor, responses were biased toward the maximum value for the Optimism, Connectedness, and Happiness factors, suggesting potential ceiling effects of the measure. It is possible that respondents were indeed high functioning, or that the five-point scale is insufficient to detect differences in wellbeing domains. The number of scale points that are needed for measures is an area of continued contention. While a limited number of scale points reduces the cognitive complexity of the items, it also might prevent individual differences and changes in positive psychological functioning from being detected. This also might speak to some of the lower cross-time reliabilities, where students at the ceiling might only be able to stay level or decline. Future studies might consider the impact of using a different number of scale points and the implications of the skewed nature of the factors.
While the results support the use of the measure for cross-sectional assessment, it is unclear whether the measure is appropriate for tracking stability and change over time or for testing the impact of interventions. Cross-time consistencies were low, with Happiness being most consistent and Engagement being least consistent. Kern et al. (2016) similarly found mixed evidence for stability, with greater stability apparent over brief periods, and less stability over time. In the current study, the lag between measurement occasions ranged from 3 to 16 months. Several schools also simultaneously introduced a number of positive psychology initiatives and programs, such that some students might be expected to change, and others would not, creating considerable noise in the data. Unfortunately, data were not available on what schools did or did not do between times of assessment. Alternatively, it could be issues with the measure itself. The extent to which low cross-time correlations were due to instability of the measure, actual changes that occurred, whether or not intervention occurred, length of time between assessments, or other confounding variables, is unclear. Future research might further test the extent to which temporal, intervention, and other factors impact the stability of EPOCH scores and determine whether or not the measure is appropriate for evaluating interventions.
We included a diverse set of participants, with 11 different samples across urban and rural places in various parts of China. However, the samples are not nationally representative and were dependent upon the schools that were willing to be involved in the assessment. Although models were consistent across gender, location, and school type, with the diversity of Chinese dialects and sub-cultures, additional consideration of cultural variations across different samples living within and outside of China is needed. While we provide norm values based on the samples included, the extent to which these norms may or may not be relevant to other Chinese sub-cultures is needed. As the current study employed self-report measures, common method variance could be a concern. Future work might combine the self-reported measure with objective physical and academic measures to achieve a more comprehensive perspective of these psychological constructs.
To move beyond treating psychopathology in a reactive manner, proactively supporting positive youth development is a necessary goal. Measurement plays an important role in understanding and building wellbeing. The current study provides support for the use of the Chinese EPOCH measure for assessing levels of adolescent positive psychological functioning in Chinese adolescents, adding to the toolbox of valid measures, and also points to the need for studies that determine the best measures for repeated measurement and intervention evaluation.
This study was carried out in accordance with the recommendations of Research Ethics Committee in Psychology Department, Tsinghua University, with written informed consent from all subjects. All subjects gave written informed consent in accordance with the Declaration of Helsinki. The protocol was approved by the Tsinghua University Research Ethics Committee. The study used an online questionnaire to investigate positive psychological functioning. Parents and students provided informed consent, and no valuable populations were included. As such, the study and was considered minimal risk study.
GZ and MK designed the study and wrote the manuscript. GZ collected the data and MK conducted the analyses.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fpsyg.2019.01457/full#supplementary-material
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Keywords: student wellbeing, wellbeing assessment, psychometric analysis, measure development, adolescents
Citation: Zeng G and Kern ML (2019) The Chinese EPOCH Measure of Adolescent Wellbeing: Further Testing of the Psychometrics of the Measure. Front. Psychol. 10:1457. doi: 10.3389/fpsyg.2019.01457
Received: 10 January 2019; Accepted: 07 June 2019;
Published: 03 July 2019.
Edited by:Cesar Merino-Soto, Universidad de San Martín de Porres, Peru
Reviewed by:Lisa Wagner, University of Zurich, Switzerland
Dandan Pang, University of Bern, Switzerland
Copyright © 2019 Zeng and Kern. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Guang Zeng, firstname.lastname@example.org