ORIGINAL RESEARCH article

Front. Psychol., 28 February 2020

Sec. Organizational Psychology

Volume 11 - 2020 | https://doi.org/10.3389/fpsyg.2020.00278

Demonstrating the Impact of Cognitive CEO on Firms’ Performance and CSR Activity

  • 1. Business School, Hohai University, Nanjing, China

  • 2. College of Economics and Management, Jiangsu Maritime Institute, Nanjing, China

  • 3. Department of Management Sciences, Government College University, Lahore, Pakistan

  • 4. School of Business, Sichuan University, Chengdu, China

  • 5. Faculty of Economics and Administrative Sciences, Çağ University, Mersin, Turkey

Abstract

One aspect of entrepreneurship psychology also clarifies individual characteristics. Drawing from entrepreneurship psychology, the concept of a cognitive CEO has been formulated using the DAE statistical technique. The study elucidates that cognitive CEOs not only boost SME performance but also invigorate CSR activity. Data for listed SMEs for the years 2016–2018 are analyzed through the panel regression technique. Significantly, the study demonstrates that CEO age is positively interlinked with the growth and CSR activity of the firm. Moreover, the empirical underpinning of the results also reveals that state-owned enterprises and firms with high total assets prefer cognitive CEOs, who accelerate the firm’s value and invigorate CSR activity. The number of independent directors is analyzed as a moderator and is concluded to be an intensifier for both SME growth and CSR activity. Finally, 2SLS instrumental panel regression is used to validate the veracity of the empirical results.

Introduction

The extant literature signifies that excellent corporate governance influences the performance of firms. Significantly, organizational support can mitigate adverse psychological factors among employees (). However, scant literature has examined the psychological aspects of the upper echelon, specifically among small–medium-sized enterprises (). Meanwhile, entrepreneurial behavior has been studied using individual attributes (education, age, etc.), showing that these can have a significant impact on the firm’s growth (). The literature on entrepreneurship psychology has signified through empirical analysis that the role of CEO is pivotal in SMEs and venture capital (; ; ) while taking strategic decisions.

Specifically, CEO psychology has been demonstrated via a CEO’s specific attributes, which can affect the firm’s performance asymmetrically (; ; ). Certainly, CEO attributes affect different aspects of an organization that are interlinked with the firm’s growth and sustainability. In this regard, analyses have been performed on the impact of CEO attributes on a firm’s cash holdings, innovation, corporate social responsibility, and earnings management (; ; ; ; ).

CEO characteristics illustrate the innovative capacity of the firm (). Extant studies have found that CEO cognitive style is interlinked with innovative capacity, but the present study contributes new insights by formulating the concept of a cognitive CEO and analyzing its effects on the performance and CSR activity of a firm.

The social cognitive theory emphasizes the individual characteristics that can either embellish or blemish performance through environmental factors (). Additionally, leaders who adopt cognitive strategies experience emphatic performance enhancement (). Meanwhile, cognitive psychology emphasizes that cognition synchronizes the brain to proceed properly (), which ultimately assists the individual in making the right decision. A CEO’s cognitive style also illustrates that he/she is a problem solver when confronting uncertainty within the organization. Moreover, an innovative style identifies a strategy that is related to problem-solving (). Hence, our independent variable, cognitive CEO, has been formulated on the basis of comparative analysis of the intangible assets ratio of an incumbent CEO along with his/her specific characteristics related to knowledge.

Cognition has been considered a significant tool that augments the innovative capabilities of employees (), which necessarily escalates a firm’s growth. In emerging countries, innovative capability has been examined under the auspices of the managerial cognition perspective and environmental strategies. Innovative capabilities are weaker where there is excessive governmental control (). We have selected Chinese firms for this empirical analysis because of their distinguishing characteristics. China adopted a market economy over the last few decades, and the corporate governance mechanism is still quite novel. CSRC1 has compelled the organizations to have a specific number of independent directors to enhance corporate governance (). Meanwhile, despite excessive governmental interference in Chinese firms and SMEs,2 even small–medium enterprises are growing rapidly while contributing to the Chinese GDP ().

The objective of the study is to contemplate whether a CEO with specific characteristics related to experience and knowledge can be conducive to a firm’s growth. Moreover, it considers whether cognitive ability also orientates the CEO toward adopting CSR activity or not. It is also significant to comprehend the role of independent directors under the auspices of a cognitive CEO.

Our study contributes theoretically and empirically. Firstly, we formulate the variable “cognitive CEO” by executing the DAE statistical technique. Secondly, we demonstrate the impact of a cognitive CEO on SME performance. Thirdly, we also contemplate the impact of a cognitive CEO on corporate social responsibly activity. Fourthly, the role of independent directors examined as a moderator of both performance and CSR activity. Last, we execute 2SLS instrumental panel regression, which indicates that our results are authentic and reliable.

Theoretical Background and Hypothesis Formulation

The extant literature has revealed that corporate governance not only influences a firm’s growth but also affects corporate social responsibility (; Zhou, 2019). One study has indicated that corporate social responsibility even influences employee performance in SMEs () while, conversely, another emphasizes the moderating role of CSR, which affects project financing (). However, the CEO is a pivotal figure who can orientate the firm toward adopting CSR measures. The prior literature has identified CEO attributes that have strongly affected both firm performance and CSR disclosure (; ). The psychological factors that are related to CEO personality have also been analyzed, revealing their strong impact on organizational risk ().

An enormous body of literature exists on how managerial cognition relates to environmental strategies, but few studies have been found that signify how the evolution of managerial cognition interlinks with environmental strategies (). Moreover, a study has demonstrated that the intensity of motivation also invigorates cognitive capability (), which ultimately assists individuals in taking drastic steps under unpredictable circumstances. Additionally, it has been witnessed that cognitive behavior under the umbrella of the social aspect does influence strategic decisions (), as it compels the upper echelon to work diligently for the firm’s growth.

More precisely, prior research on CEOs can be segregated into three categories. First, firm growth and CEO personality in terms of the five personality aspects (conscientiousness, emotional stability, agreeableness, extraversion, and openness) have been examined (; ). Second, some studies have emphasized specific CEO attributes, including both positive and negative aspects (self-evaluation, charisma, humility, narcissism, overconfidence, and hubris) (), that influence different features of the firm asymmetrically. Third, some studies have revealed that CEO values (e.g., collectivism, novelty, self-direction, benevolence, and organizational identification) not only influence the growth of a firm but also its corporate social responsibility. Specifically, a recent study has witnessed that CEO cognition also escalates a firm’s performance even if the firm has entered into a declining phase (). Hence, we can encapsulate the above research to formulate the hypothesis that a cognitive CEO should enhance a firm’s growth.

  • H1: A cognitive CEOs boosts the firm’s growth.

It is at the CEO’s discretion to either adopt innovative measures or to disclose CSR activities (Davidson et al., 2018). Interestingly, prior studies have found interlinks of firms’ CSR activities with CEO demographics and specific characteristics (; Davidson et al., 2018). Further, a recent study on materialistic CEOs has demonstrated that they are less oriented toward corporate social responsibility when compared to non-materialistic CEOs (Davidson et al., 2018). However, our variable “cognitive CEO” is based on variables named “CEO experience, CEO education, number of meetings attended by CEO, and goodwill,” which have been contemplated by some studies and revealed to have a positive relationship with CSR activity (; ; ; ). This guides us to the second hypothesis.

  • H2: Cognitive CEOs enhance CSR activity.

Independent Directors as a Moderator for Cognitive CEO and Firm Performance, CSR

Chinese organizations have enhanced their corporate structure via introducing a specific number of independent directors (), who have strengthened the firms’ growth through constant vigilance (). Some studies have found that having a high proportion of independent directors mitigates organizational risk (), which ultimately invigorates the firm’s profitability. Meanwhile, the presence of independent directors is also conducive to CSR disclosure (). Arguably, independent directors are not only representatives of minority shareholders but are also stakeholders that compel the CEOs to promote CSR activity (). Therefore, the role of the independent director as a moderator should enhance a firm’s growth and CSR activity emphatically. Thus, the following hypotheses are made:

  • H3a: Independent directors as a moderator augment the firm’s performance.

  • H3b: Independent directors as a moderator intensify the CSR activity.

Data Collection and Measures

We have selected SME data listed on Chinese stock exchanges from 2016 through 2018. Data has been accumulated from CSMAR and WIND following the extant literature (; ; ). The independent variable, cognitive CEO, has been formulated via analyzing the five variables. Following the extant literature, cognition is defined as the knowledge that has been gained through experience and the senses (). Consequently, a CEO can utilize his or her cognition to make the right decision. Therefore, we have selected these variables (CEO experience, CEO compensation, the number of meetings attended by the CEO, goodwill, and intangible assets ratio) that signify his/her cognitive ability. CEO tenure, CEO compensation, goodwill, and the number of meetings attended by the CEO represent how much knowledge, either tacit knowledge or working knowledge, the incumbent CEO will gain, which will ultimately affect the intangible assets of the company. Moreover, motivation is also a vigorous vehicle that boosts hidden capabilities to work with enthusiasm. In this regard, CEO compensation3 has been included in formulating the cognitive CEO variable. The cognitive CEO variable has been formulated using the DAE4 statistical technique. If the incumbent CEO performs better in terms of output (intangible assets ratio) with the given input (the above four variables), then he/she was deemed a cognitive CEO5 and was assigned “1”; otherwise, he/she was assigned “0.” Firstly, we have taken the logarithm of cognitive CEO and have assigned the value “1” if its logarithmic value is greater than the mean value; otherwise, it has been assigned the value “0.” Mathematically, the cognitive CEO has been formulated as follows:

In Eq. 1, there are “q” inputs and “k” outputs. In this case, our output is the intangible assets ratio, whereas our inputs are CEO experience, CEO compensation, number of meetings attended by the CEO, and goodwill.

Equation 1 emphasizes that all input variables (CEO experience, CEO education, number of meetings attended by the CEO, goodwill) should perform very well, causing a boost in the intangible assets of the firm. Additionally, corporate social responsibility disclosure has been formulated in consideration of the 13 attributes. Though the prior literature (), has formulated corporate social responsibility disclosure measures by emphasizing 11 attributes,6 our CSR ratio has been formulated by considering 13 attributes (as presented in Table 1). Mathematically,

TABLE 1

AttributeMeasurement
1Whether the firm has indulged in social donationYes = 1, No = 0
2Whether the firm has been verified by a third-party agencyYes = 1, No = 0
3Whether the firm refers to the GRI Sustainability Report GuideYes = 1, No = 0
4Whether the firm discloses the protection of shareholders’ rightsYes = 1, No = 0
5Whether the firm discloses the protection of creditors’ rightsYes = 1, No = 0
6Whether the firm discloses the protection of employee rightsYes = 1, No = 0
7Whether the firm discloses the protection of supplier rightsYes = 1, No = 0
8Whether the firm discloses the protection of customers’ and consumers’ rightsYes = 1, No = 0
9Whether the firm discloses environmental and sustainable developmentYes = 1, No = 0
10Whether the firm discloses public relations and social welfare undertakingsYes = 1, No = 0
11Whether the firm discloses the construction of a social responsibility system and improvement measuresYes = 1, No = 0
12Whether the firm discloses safety production contentYes = 1, No = 0
13Whether the firm discloses its shortcomingsYes = 1, No = 0

Formulation of CSR index.

where “Zpi,t” indicates the different attributes for different listed firms.

In Table 1, 13 attributes have been signified for the formulation of CSSR.

Further, following the extant literature (; Zhu et al., 2016; ; ; ), we have selected the control variables “EPS” (earnings per share), “AGE” (age of cognitive CEO), “Dual” (CEO having two offices), “SOE” (state-owned enterprise), “Firm Size” (logarithm of number of employees), “LNTA” (logarithm of total assets), “Fage” (firm age), and “Leverage.”

Empirical Models

The panel regression technique is the preferred method for analyzing longitudinal and cross-sectional data. Through confirmation of the Hausman test, fixed effect panel regression has been selected, which also captures the characteristics of unobservable variable characteristics. Mathematically, the panel regression is expressed as follows:

Equations 3 and 5 indicate the effect of a cognitive CEO on a firm’s performance. “ROA” and “ROI” have been endorsed as proxies for measuring the firm’s performance (; ). Additionally, Eqs 4 and 6 demonstrate the impact of a cognitive CEO on CSR activity. The interaction term (CCEOit×INDIRit) in Eqs 5 and 6 indicates the effect of independent directors as a moderator of firm performance and CSR activity.

Empirical Results

In this section, the empirical results of panel regression (see Eqs 3–6) are presented. The authenticity of the results has also been assessed through 2SLS instrumental regression. Since cognition is based on knowledge, we have selected CEO technical education as an instrumental variable.7Table 2 details the descriptive statistics. The variables “CCEO” (cognitive CEO), “Degree” (education), “AGE” (age of CEO), “Dual” (CEO having two offices), and “SOE” (state-owned enterprise) are dummy variables. Moreover, the number of observations is almost the same, although some variables have fewer observations due to missing data.

TABLE 2

VariableObsMeanSDMinMax
CSSR16030.60070060.11780940.23076920.9230769
INDIR16033.7716781.214877213
EPS16010.30417710.8210663−6.85992117.53427
ROA16020.09520362.735636−6.776046108.3657
ROI15990.26898510.669638−0.56130611.85493
Leverage16010.54089620.54289130.0156111.50969
CCEO15920.10113070.301596401
AGE15920.04773870.213279801
LNTA160122.304351.43845414.9416428.55011
FSZ16017.6986421.4734361.60943811.47645
Dual15730.18626830.389446801
Fage160315.808484.084944027
SOE16030.50467870.500134101

Descriptive statistics.

Table 2 gives the descriptive statistics of the different variables. “Fage” represents firm age whereas “FSZ” indicates firm size. The descriptive statistics also witness that all variables have a relatively low standard deviation.

Table 3 illustrates the correlation between variables. The variable “AGE” has the correlation “0.5462,” whereas all other variables have lower correlation values. Hence, there is no threat of the multicollinearity problem.

TABLE 3

CSSRROAROIEPSLEVCCEOAGELNTALNEMPDualSOE
CSSR1.000
ROA0.00591.000
ROI0.0021−0.00481.000
EPS0.00790.37250.03261.000
LEV0.0134−0.3012−0.0209−0.19591.000
CCEO0.0390.06320.0859−0.02120.0321.000
AGE0.01310.05690.0042−0.02350.05490.54721.000
LNTA−0.03520.0108−0.00740.2364−0.0200−0.0420−0.0241.000
FSZ−0.06620.0052−0.00300.1590−0.0722−0.0272−0.0280.48311.000
Dual0.0404−0.0099−0.0293−0.05010.0339−0.00670.009−0.0697−0.06191.000
SOE0.0676−0.0133−0.00930.00750.00820.01200.0010.07510.0964−0.04561
Fage0.19480.03260.02820.03680.90200.02730.005−0.0391−0.1303−0.05230.071

Correlation matrix.

Table 3 signifies that all variables are less correlated except “AGE (CEO age)” (“0.5472”), which is also acceptable for empirical analysis.

Table 4 reveals that a cognitive CEO (CCEO) boosted the firm’s performance significantly (tenth row and third and fourth columns of Table 3). In the third column of Table 4, the coefficient of ROI is “0.118,” whereas the coefficient of ROA is “0.0435” for a cognitive CEO (CCEO). The results support our first hypothesis (H1). Additionally, the variables “lnTA,” “Fage,” and “AGE” positively boosted firm growth. “SOE” is also positively significant, which indicates that having a cognitive CEO in a state-owned enterprise is highly advantageous for escalating firm growth. Meanwhile, the first row of columns (1) and (2) indicates the coefficient values of the interaction term (cognitive CEO term and independent directors). The coefficient values of CCEO∗INDIR (0.0955∗∗, 0.436∗∗∗, respectively, are greater than the coefficient value of CCEO (0.0435∗∗, 0.118∗∗∗, respectively), which indicates that the presence of independent directors assists even a cognitive CEO in escalating firm growth significantly. This result satisfies hypothesis H3a.

TABLE 4

(1)(2)(3)(4)




VariablesROAROIROIROA
CCEO*INDIR0.0955**0.436***
(0.0982)(0.147)
EPS0.169***0.02330.02300.169***
(0.0118)(0.0200)(0.0200)(0.0118)
Leverage−0.176***−0.0174−0.0233−0.177***
(0.0172)(0.0291)(0.0292)(0.0172)
AGE0.146*0.382**0.335**0.140*
(0.0849)(0.152)(0.137)(0.0798)
LNTA0.0157*0.00684*0.00538*0.0156*
(0.00891)(0.0151)(0.0151)(0.00890)
FSZ−0.006170.001480.00179−0.00609
(0.00859)(0.0146)(0.0146)(0.00860)
Dual0.0126−0.0384−0.03520.0135
(0.0235)(0.0400)(0.0402)(0.0236)
SOE0.00709*0.0172*0.00895*0.00637*
(0.0184)(0.0311)(0.0314)(0.0184)
Fage0.00413**0.00382*0.00374*0.00351*
(0.00231)(0.00395)(0.00395)(0.00231)
CCEO0.118***0.0435**
(0.0418)(0.0242)
Constant0.409**0.2950.2980.409**
(0.165)(0.280)(0.281)(0.165)
Observations1,5551,5511,5511,555
R20.2040.0900.2030.203

2SLS Instrumental regression (cognitive CEO and performance).

Standard errors in parentheses. ***p < 0.01, **p < 0.05, *p < 0.1. Table 4 reveals that “CCEO” (Cognitive CEO) and “CCEO*INDIR” are positively significant for “ROA” and “ROI.” In Table 4, the coefficient values of “CCEO*INDIR” are “0.095**” and “0.436***,” whereas the coefficient values of CCEO are “0.118** and “0.409,” respectively. Through comparison, it has been confirmed that, as a moderator, independent directors boost the firm’s growth strongly. Meanwhile, the variables “Fage” (firm age), “SOE,” “AGE” (CEO age), and “LNTA” (total assets) are positively significant.

Table 5 signifies that a cognitive CEO promotes the disclosure of CSR activity [eleventh row and columns (4) and (5)]. Additionally, the interaction of a CCEO and independent directors enhances the CSR activity [first row and columns (1) and (3)]. Specifically, the coefficient values of CCEO∗INDIR (0.0244, 0.0170, and 0.0169) are greater than the coefficient values of CCEO (0.00424 and 0.00601), which argues that the vigilance of independent directors has compelled the cognitive CEO to disclose the CSR activity. Moreover, the variables “SOE,” “AGE,” “LNTA,” and “SOE” boost the CSR activity.

TABLE 5

(1)(2)(3)(4)(5)





VariablesCSRRCSRRCSRRCSRRCSRR
CCEO*INDIR0.0244**0.0170**0.0169**
(0.0317)(0.0274)(0.0275)
EPS0.001350.00126−0.000290−0.0003010.00130
(0.00382)(0.00382)(0.00366)(0.00366)(0.00382)
Leverage−0.00119−0.000831−0.00138
(0.00555)(0.00555)(0.00557)
AGE0.00784**0.00919**0.00902**0.00675**0.00522*
(0.0274)(0.0286)(0.0286)(0.0269)(0.0258)
LNTA7.15e-05*6.51e-05*0.000649**0.000626*4.54e-05*
(0.00288)(0.00288)(0.00286)(0.00286)(0.00288)
FSZ−0.00405−0.00402−0.00391−0.00390−0.00403
(0.00278)(0.00278)(0.00277)(0.00277)(0.00278)
Dual−0.00994−0.00974−0.0106−0.0105−0.00970
(0.00761)(0.00761)(0.00761)(0.00762)(0.00762)
SOE0.0149**0.0153**0.0141**0.0144**0.0140**
(0.00594)(0.00592)(0.00593)(0.00593)(0.00595)
Fage0.00528***0.00526***0.00520***0.00522***0.00530***
(0.000747)(0.000747)(0.000745)(0.000744)(0.000747)
CCEO0.00424**0.00601**
(0.00690)(0.00783)
Constant0.540***0.540***0.527***0.527***0.540***
(0.0534)(0.0534)(0.0531)(0.0531)(0.0534)
Observations1,5551,5551,5561,5561,555
R20.1810.1810.1800.1800.181

2SLS Instrumental regression (cognitive CEO and CSR activity).

Standard errors in parentheses. ***p < 0.01, **p < 0.05, *p < 0.1. Table 5 reveals that CCEO and CCEO*INDIR are positively significant for CSR ratio (tenth and first row). Additionally, the variables “AGE,” “Fage,” “LNTA,” and “SOE” are positively significant for CSSR.

Conclusion

Chinese SMEs contribute more than 60% of Chinese GDP (). Therefore, studying Chinese SMEs is worthwhile and necessary to divulge their secrets. Chinese firms are allegedly under the strict surveillance of the government, but their growth is strong and undeterred. Corporate governance among Chinese firms is novel, but its role is vital for sustainability. However, the role of the CEO is pivotal in making decisions and taking drastic steps under uncertain circumstances. In this regard, entrepreneurship psychology orientates the organizational theorist to contemplate the specific attributes of a CEO that can accelerate a firm’s growth. Further, individual psychological aspects of a CEO also matter in adopting CSR measures, as they signify how much of a philanthropist the CEO is. Additionally, CSR disclosure elucidates whether a CEO is concerned about minority shareholders and stakeholders. The concept of a cognitive CEO is based on the idea of best utilization of knowledge (either tacit knowledge or working knowledge) that can assist him/her in achieving goals. Empirical results have unveiled that cognitive CEOs boost firms’ growth and adoption of CSR. Further, cognitive CEOs perform extremely well under the vigilant surveillance of independent directors. Moreover, older CEOs endorse CSR disclosure and boost the firm’s growth. Finally, firms like state-owned enterprises, mature firms, or firms acquiring large total assets show a positive relationship between performance and CSR disclosure. To summarize, this study recommends that firms should prefer CEOs who are mature, have technical knowledge (either economics, law, or engineering), and have long tenure, as they will boost performance and also disclose CSR activities. Further, this study has also suggested that having a specific number of independent directors will enhance performance through their vigilant surveillance.

Study Limitations

Although this study has contributed a lot, there are some specific limitations that could be addressed in future study. First, the cognitive CEO has been formulated using specific variables and could be reformulated by incorporating different variables. Second, the impact of a cognitive CEO should be demonstrated for different aspects of organizations (e.g., cash holding, earnings management, etc.). Last, it is recommended that the effectiveness of cognitive CEOs for United States or European firms be analyzed.

Statements

Data availability statement

The datasets generated for this study are available on request to the corresponding author.

Ethics statement

All study procedures were approved by the Ethics Committee of the Hohai University and informed consent of the participations was implied through survey completion.

Author contributions

HL and SS conceived the study and were responsible for the design, and development of the data analysis. HL, YH, and AA were responsible for the data collection and analysis. SS and AA was responsible for the data interpretation. SS wrote the first draft of the manuscript. YH and IO reviewed the manuscript. All authors approved the manuscript.

Funding

This study was funded by the National Social Science Fund of China (Grant# 18BGL129).

Conflict of interest

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.

Footnotes

1.^The Chinese Security Regulatory Council compelled Chinese firms to have a minimum of three independent directors among board members to enhance corporate governance ().

2.^According to Zhao et al. (2013), 99% of Chinese chemical firms are SMEs, which means that corporate social responsibility is the main concern for these companies.

3.^CEO compensation has a positively significant impact on performance ().

4.^DAE is a statistical technique used to demonstrate the relative efficiency of separable variables ().

5.^ and , analyzed the impact of CEO ability and manager ability, formulated on the basis of the DAE technique.

6.^A prior study () emphasized seven attributes related to reporting.

7.^The correlation between instrumental variable (CEO technical education) and cognitive CEO is “0.7863” while with CSSR is “0.0098,” which satisfy the condition of an instrumental variable. The technical education is a dummy variable which equals “1” if the CEO has a degree related to economics, management sciences or law, and “0” otherwise ().

References

Summary

Keywords

corporate governance, entrepreneurship psychology, cognitive CEO, SME performance, CSR activity

Citation

Li H, Hang Y, Shah SGM, Akram A and Ozturk I (2020) Demonstrating the Impact of Cognitive CEO on Firms’ Performance and CSR Activity. Front. Psychol. 11:278. doi: 10.3389/fpsyg.2020.00278

Received

22 December 2019

Accepted

05 February 2020

Published

28 February 2020

Volume

11 - 2020

Edited by

Muhammad Ibrahim Abdullah, COMSATS University Islamabad, Lahore Campus, Pakistan

Reviewed by

Yongzhong Jiang, The University of Kansas, United States; Murat I. Haseki, Çukurova University, Turkey

Updates

Copyright

*Correspondence: Syed Ghulam Meran Shah,

This article was submitted to Organizational Psychology, a section of the journal Frontiers in Psychology

Disclaimer

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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