Abstract
Objective:
Oxidative Balance Score (OBS) is an index affecting the oxidative stress of dietary and lifestyle factors. We aimed to explore the association of OBS with prostate specific antigen (PSA) among older males.
Methods:
A total of 5,136 samples were collected in this study to investigate the relationship between OBS and PSA from the National Health and Nutrition Examination Survey. Logistic regression models and restricted cubic spline were used to assess the associations between OBS and PSA.
Results:
Compared with the Q1 group, the odds ratios for the association between OBS and PSA were 1.005 (1.003, 1.009), 1.003 (1.001, 1.006), and 1.001 (0.978, 1.022) for Q2, Q3, and Q4, respectively. In the age-specific analyses, the association was significant among individuals aged 65 years old and over: the odds ratios for the association between OBS and PSA were 1.019 (1.005, 1.028), 1.028 (1.018, 1.039), and 1.038 (1.022, 1.049) for Q2, Q3, and Q4, respectively. But it was not significant among individuals aged less than 65 years old: the odds ratios for the association between OBS and PSA were 1.016 (0.995, 1.026), 1.015 (0.985, 1.022), and 0.988 (0.978, 1.016) for Q2, Q3, and Q4, respectively. The restricted cubic splines also indicated a nonlinear relationship between OBS and PSA among individuals aged 65 years old and over (Poverall = 0.006, Pnonlinear = 0.021).
Conclusion:
Our findings provide evidence that OBS is positively associated with higher levels of PSA among older adults. Further large-scale prospective cohort studies are needed to verify our findings.
Introduction
Prostate cancer (PC) is the third most common cancer worldwide and one of the most common malignancies among men, alongside lung and colon tumors, resulting in an estimated 161,360 new cases of prostate cancer and 26,730 deaths in the United States in 2017 (1–3). Since the promotion of serum prostate-specific antigen (PSA) screening and the development of prostate biopsy in the late 1980s, the number of confirmed cases of prostate cancer increased significantly (4, 5). The incidence of prostate cancer reached a peak in 1992, decreased between 1992 and 1995, and then increased at a rate of about 1% per year (6). According to the latest studies, prostate cancer has become the second most common malignant tumor among male tumors, with an estimated 165, 000 newly diagnosed cases and 29,000 deaths in 2018 (7, 8).
Prostate-specific antigen (PSA) has become an indispensable tumor marker for the diagnosis of prostate cancer and has been widely used for disease monitoring, staging and diagnosis, and early diagnosis, in addition to being an immunohistochemical marker (9). Serum levels are also affected by factors such as age, prostate size, and ethnicity (10). The change of the prostate surrounding environment is also the main factor affecting the serum.
The occurrence and advancement of PC have been linked to oxidative stress, which is an imbalance between the antioxidant defense system’s generation and scavenging of reactive oxygen species (ROS) (11). Numerous dietary elements and lifestyle choices have been linked to oxidative stress. An individual’s oxidative/antioxidant state was evaluated using the Oxidative Balance Score (OBS), which was calculated by adding up the pro- and antioxidant components of dietary and lifestyle factors (12). OBS has been shown to be useful in treating a number of chronic conditions, such as hypertension and gastric reflux. Its ability to measure diet and lifestyle choices that may have a negative impact on health was particularly valuable in epidemiological research (13–15). It is unknown, however, if OBS and PSA are related.
Therefore, we carried out a cross-sectional investigation into the relationship between OBS and PSA in the current study. Based on data from National Health and Nutrition Examination Surveys, the study was carried out among adult US citizens.
Methods
Study population
Data for the study were gathered using questionnaires, interviews, physical examinations, and laboratory testing from the National Health and Nutrition Examination Surveys (NHANES 2003–2010) (16). An online description of NHANES can be found at https://wwwn.cdc.gov/nchs/nhanes/analyticguidelines.aspx. The National Center for Health Statistics Institutional Review Board approved the study, and written informed consent was obtained from each participant. First included in our study were 17,902 individuals with OBS data aged equal to or more than 20 years old from continuous NHANES (2003–2010) datasets. Women (n = 9,402), individuals without a PSA (n = 2,246), those without an OBS, and any missing basic data (n = 1,118) were also eliminated. Ultimately, our research encompassed 5,136 people in total. The study’s flowchart is shown in Supplementary Figure S1.
Definition of OBS
Based on prior information about the relationship between nutrients or lifestyle factors and OS, 16 nutrients and four lifestyle factors were screened to calculate OBS, of which five were pro-oxidants and 15 were antioxidants (17, 18). Of these, 16 nutrients were calculated from the mean of the various ingredients from the nutrition interviews on day 1 and day 2 to calculate the quantile as the scoring threshold. Supplementary Table S1 shows the distribution scheme of OBS components. We divided the other components into three groups by sex-specific quantiles. The antioxidants were assigned to one-third of the group at points 0 to 2. The point distribution of the pro-oxidant was reversed, with 0 points representing the highest quantile and 2 points representing the lowest. Finally, the OBS scores of each participant were summed to get the final OBS value of each participant.
Assessment of PSA
The most prevalent non-cutaneous cancer in males is prostate cancer, and total PSA testing has been identified as a tumor marker for cancer detection, diagnosis, and therapy. For men 40 years of age and above, the survey measures total prostate-specific antigen (PSA). Blood samples were subjected to PSA immunoassays utilizing the Hybritech test (Beckman Coulter, Fullerton, CA). A paramagnetic particle coated with a second mouse monoclonal anti-PSA antibody and a mouse monoclonal anti-PSA alkaline phosphatase conjugate were placed into a reaction vessel together with a second sample. While the monoclonal anti-PSA adjuvant interacts with several antigenic sites on the sample PSA, the PSA in the sample binds to the monoclonal anti-PSA immobilized on the solid phase. The amount of light produced is directly correlated with the PSA levels in the sample. The typical PSA level was 0–4 ng/mL (19).
Covariates
Face-to-face interviews were used to gather information on age, gender, education levels, race, and ethnicity (Mexican American, Other Hispanic, Non-Hispanic White, Non-Hispanic Black, and others), family income-poverty ratios (PIR), smoking, and drinking. Physical examinations were used to determine body mass index (BMI). Weight (in kilos) divided by height (in meters squared) yielded the BMI. PIR was computed by dividing family (or individual) income by the survey year’s specific poverty guidelines, which differed according to the household size and the area. Lower PIR indicated a higher degree of poverty, whereas a ratio of one indicated the same income and level of poverty. Those who had smoked at least 100 cigarettes in their lifetime were considered smokers. Individuals who had ingested one or more alcoholic beverages throughout the preceding year were identified as current drinkers.
Statistical analysis
For continuous variables, the mean (SD) was reported, and for categorical variables, the numbers (percentages) represented the basic features of the participants. For categorical or continuous variables, the T test or the Chi-square test was used. Four distinct scenarios were employed in logistic regression models to evaluate the relationships between OBS and PSA. Additionally, limited cubic splines were employed to evaluate the link between OBS and PSA’s dose and response. Age, BMI, sex, education, race/ethnicity, marital status, PIR, drinking and smoking habits, diabetes, hypertension, and marriage were among the covariates. Furthermore, age has been identified as a primary risk factor for PSA. Consequently, stratified analyses based on age—that is, age < 65 and age ≥ 65—were used to examine the relationship between OBS and PSA. Software from SAS Institute Inc., Cary, NC, version 9.4 was used for all statistical analyses. p < 0.05 was used as the threshold for significance in the two-sided statistical tests.
Results
The basic characteristics of the subjects are presented in Table 1. A total of 5,136 participants were included in our study; the number of OBS in different quartiles was 1,290, 1,358, 1,214, and 1,194, respectively. And the mean PSA was 1.67, 1.84, 1.68, and 2.07, respectively. We found that all variables except for hypertension were statistically significant between different quartiles of OBS (p = 0.475). The characteristics of the subjects aged below 65 and equal to and over 65 are presented in Supplementary Tables S2, S3; the results were similar to the total population.
Table 1
| All | Q1 (N = 1,290) | Q2 (N = 1,358) | Q3 (N = 1,214) | Q4 (N = 1,194) | p |
|---|---|---|---|---|---|
| OBS value | −0.48 (1.87) | 5.50 (1.74) | 11.4 (1.71) | 18.3 (2.58) | |
| Age | 61.6 (12.1) | 60.6 (12.8) | 59.1 (12.8) | 57.1 (12.1) | <0.001 |
| Race | <0.001 | ||||
| Mexican American | 217 (16.8%) | 249 (18.3%) | 228 (18.8%) | 163 (13.7%) | |
| Other Hispanic | 102 (7.91%) | 77 (5.67%) | 78 (6.43%) | 63 (5.28%) | |
| Non-Hispanic White | 579 (44.9%) | 742 (54.6%) | 699 (57.6%) | 809 (67.8%) | |
| Non-Hispanic Black | 354 (27.4%) | 250 (18.4%) | 165 (13.6%) | 131 (11.0%) | |
| Other Race | 38 (2.95%) | 40 (2.95%) | 44 (3.62%) | 28 (2.35%) | |
| Education | <0.001 | ||||
| Less than 9th grade | 310 (24.0%) | 219 (16.1%) | 155 (12.8%) | 90 (7.54%) | |
| 9–11th grade | 240 (18.6%) | 211 (15.5%) | 148 (12.2%) | 109 (9.13%) | |
| High school graduate | 338 (26.2%) | 311 (22.9%) | 290 (23.9%) | 262 (21.9%) | |
| Some college or AA degree | 268 (20.8%) | 334 (24.6%) | 325 (26.8%) | 330 (27.6%) | |
| College graduate or above | 133 (10.3%) | 282 (20.8%) | 296 (24.4%) | 403 (33.8%) | |
| Refused | 1 (0.08%) | 0 (0.00%) | 0 (0.00%) | 0 (0.00%) | |
| Do not Know | 0 (0.00%) | 1 (0.07%) | 0 (0.00%) | 0 (0.00%) | |
| PIR | 2.33 (1.52) | 2.70 (1.58) | 3.04 (1.60) | 3.31 (1.61) | <0.001 |
| Marriage | <0.001 | ||||
| Married | 831 (64.4%) | 929 (68.5%) | 860 (70.8%) | 870 (72.9%) | |
| Widowed | 89 (6.90%) | 98 (7.22%) | 67 (5.52%) | 52 (4.36%) | |
| Divorced | 166 (12.9%) | 131 (9.65%) | 130 (10.7%) | 120 (10.1%) | |
| Separated | 48 (3.72%) | 42 (3.10%) | 31 (2.55%) | 24 (2.01%) | |
| Never married | 97 (7.52%) | 83 (6.12%) | 71 (5.85%) | 68 (5.70%) | |
| Living with partner | 58 (4.50%) | 74 (5.45%) | 53 (4.37%) | 60 (5.03%) | |
| Refused | 1 (0.08%) | 0 (0.00%) | 1 (0.08%) | 0 (0.00%) | |
| Do not Know | 0 (0.00%) | 0 (0.00%) | 1 (0.08%) | 0 (0.00%) | |
| Total PSA (ng/mL) | 1.67 (2.56) | 1.84 (3.36) | 1.68 (2.66) | 2.07 (4.11) | 0.006 |
| Smoking | <0.001 | ||||
| Yes | 728 (66.4%) | 710 (63.2%) | 611 (61.1%) | 530 (54.5%) | |
| No | 368 (33.5%) | 414 (36.8%) | 389 (38.9%) | 443 (45.5%) | |
| Do not know | 1 (0.09%) | 0 (0.00%) | 0 (0.00%) | 0 (0.00%) | |
| Alcohol | <0.001 | ||||
| Yes | 361 (31.4%) | 354 (28.9%) | 301 (27.7%) | 259 (23.7%) | |
| No | 790 (68.6%) | 870 (71.0%) | 787 (72.3%) | 834 (76.3%) | |
| Do not know | 0 (0.00%) | 1 (0.08%) | 0 (0.00%) | 0 (0.00%) | |
| Diabetes | <0.001 | ||||
| Yes | 272 (21.1%) | 214 (15.8%) | 176 (14.5%) | 136 (11.4%) | |
| No | 985 (76.4%) | 1,103 (81.2%) | 1,010 (83.2%) | 1,035 (86.7%) | |
| Borderline | 31 (2.40%) | 39 (2.87%) | 28 (2.31%) | 23 (1.93%) | |
| Do not know | 2 (0.16%) | 2 (0.15%) | 0 (0.00%) | 0 (0.00%) | |
| Hypertension | 0.475 | ||||
| Yes | 58 (4.86%) | 53 (4.31%) | 52 (4.59%) | 40 (3.58%) | |
| No | 1,135 (95.1%) | 1,176 (95.7%) | 1,081 (95.4%) | 1,077 (96.4%) | |
| BMI (Kg/m2) | <0.001 | ||||
| Normal (25<) | 301 (23.3%) | 395 (29.1%) | 377 (31.1%) | 386 (32.3%) | |
| Overweight (25 ≤ BMI < 30) | 434 (33.6%) | 496 (36.5%) | 437 (36.0%) | 464 (38.9%) | |
| Obesity (≥30) | 555 (43.0%) | 467 (34.4%) | 400 (32.9%) | 344 (28.8%) | |
| OBS components | |||||
| Dietary OBS components | |||||
| Calcium (mg/d) | 0.20 (0.42) | 0.60 (0.68) | 1.04 (0.72) | 1.56 (0.62) | <0.001 |
| Magnesium (mg/d) | 0.07 (0.26) | 0.54 (0.59) | 1.22 (0.56) | 1.83 (0.39) | <0.001 |
| Zinc (mg/d) | 0.16 (0.40) | 0.58 (0.67) | 1.08 (0.69) | 1.60 (0.58) | <0.001 |
| Copper (mg/d) | 0.11 (0.35) | 0.57 (0.62) | 1.13 (0.65) | 1.72 (0.49) | <0.001 |
| Selenium (mcg/d) | 0.19 (0.42) | 0.58 (0.65) | 1.05 (0.75) | 1.51 (0.67) | <0.001 |
| Total fat (g/d) | 0.33 (0.58) | 0.66 (0.72) | 0.98 (0.79) | 1.33 (0.77) | <0.001 |
| Dietary fiber (g/d) | 0.24 (0.47) | 0.75 (0.69) | 1.27 (0.69) | 1.73 (0.49) | <0.001 |
| Carotene (RE/d) | 0.62 (0.76) | 0.98 (0.82) | 1.16 (0.77) | 1.47 (0.66) | <0.001 |
| Riboflavin (mg/d) | 0.19 (0.43) | 0.61 (0.68) | 1.09 (0.71) | 1.67 (0.52) | <0.001 |
| Niacin (mg/d) | 0.13 (0.36) | 0.49 (0.62) | 1.00 (0.69) | 1.62 (0.57) | <0.001 |
| Vitamin B6 (mg/d) | 0.09 (0.31) | 0.56 (0.61) | 1.13 (0.66) | 1.75 (0.45) | <0.001 |
| Total folate (mcg/d) | 0.14 (0.38) | 0.59 (0.63) | 1.16 (0.67) | 1.72 (0.49) | <0.001 |
| Vitamin B12 (mcg/d) | 0.26 (0.50) | 0.70 (0.73) | 1.06 (0.75) | 1.56 (0.63) | <0.001 |
| Vitamin C (mg/d) | 0.46 (0.65) | 0.89 (0.78) | 1.12 (0.77) | 1.53 (0.63) | <0.001 |
| Vitamin E (ATE) (mg/d) | 0.20 (0.45) | 0.65 (0.70) | 1.09 (0.72) | 1.65 (0.54) | <0.001 |
| Iron (mg/d) | 0.20 (0.44) | 0.61 (0.67) | 1.13 (0.70) | 1.62 (0.58) | <0.001 |
| Lifestyle OBS components | |||||
| Leisure time physical activity | 1.24 (0.42) | 1.33 (0.47) | 1.37 (0.48) | 1.49 (0.50) | <0.001 |
| Alcohol (g/d) | 1.85 (0.46) | 1.68 (0.63) | 1.58 (0.70) | 1.48 (0.77) | <0.001 |
| Cotinine (ng/mL) | 1.18 (0.79) | 0.93 (0.81) | 0.87 (0.81) | 0.71 (0.78) | <0.001 |
The baseline characteristics of included samples by quartiles of the OBS.
OBS, oxidative balance score; BMI, body mass index; PIR, poverty-to-income ratio.
The association between the OBS and PSA is presented in Table 2. Compared with the quartile 1 group, the odds ratios for the association between OBS and PSA were 1.005 (1.003, 1.009), 1.003 (1.001, 1.006), and 1.001 (0.978, 1.022) for quartile 2, quartile 3, and quartile 4, respectively, after adjusting for other covariates. In the age-specific analyses, the association was significant among individuals 65 years old and over, not among individuals aged less than 65 years old. For individuals aged 65 years old and over, the odds ratios for the association between OBS and PSA were 1.019 (1.005, 1.028), 1.028 (1.018, 1.039), and 1.038 (1.022, 1.049) for Q2, Q3, and Q4, respectively, after adjusting for other covariates. For individuals aged less than65 years old, the odds ratios for the association between OBS and PSA were 1.016 (0.995, 1.026), 1.015 (0.985, 1.022), and 0.988 (0.978, 1.016) for Q2, Q3, and Q4, respectively.
Table 2
| Q1 | Q2 | Q3 | Q4 | |
|---|---|---|---|---|
| All | ||||
| Model 1 | ref | 1.016 (1.015, 1.016) | 1.008 (1.008, 1.009) | 0.999 (0.999, 1.000) |
| Model 2 | ref | 1.013 (1.001, 1.025) | 1.007 (1.000, 1.012) | 1.002 (0.998, 1.022) |
| Model 3 | ref | 1.007 (1.002, 1.011) | 1.003 (1.001, 1.008) | 1.002 (0.988, 1.022) |
| Model 4 | ref | 1.005 (1.003, 1.009) | 1.003 (1.001, 1.006) | 1.001 (0.978, 1.022) |
| <65 | ||||
| Model 1 | ref | 1.012 (1.012, 1.013) | 0.998 (0.998, 1.098) | 0.985 (0.987, 1.099) |
| Model 2 | ref | 1.008 (0.985, 1.013) | 1.003 (0.998, 1.006) | 0.993 (0.978, 1.002) |
| Model 3 | ref | 1.016 (0.988, 1.012) | 1.002 (0.978, 1.026) | 0.985 (0.966, 1.085) |
| Model 4 | ref | 1.016 (0.995, 1.026) | 1.015 (0.985, 1.022) | 0.988 (0.978, 1.016) |
| ≥65 | ||||
| Model 1 | ref | 1.011 (1.010, 1.011) | 1.021 (1.016, 1.032) | 1.032 (1.018, 1.041) |
| Model 2 | ref | 1.001 (1.000, 1.002) | 1.012 (1.002, 1.026) | 1.026 (1.008, 1.036) |
| Model 3 | ref | 1.018 (1.005, 1.021) | 1.025 (1.014, 1.032) | 1.035 (1.019, 1.048) |
| Model 4 | ref | 1.019 (1.005, 1.028) | 1.028 (1.018, 1.039) | 1.038 (1.022, 1.049) |
Odds ratio for the association between the OBS and PSA.
Model 1: unadjusted.
Model 2: adjusted for sex, age (years, continuous), education (less than high school, high school graduate, some college and above), race (non-Hispanic White, non-Hispanic Black, Mexican American, other), Marriage (married, widowed, divorced, separated, never married, living with partner), and PIR.
Model 3: Model 2 plus self-reported alcohol status (yes, no) and self-reported smoking status (yes, no).
Model 4: Model 3 plus adjusted for BMI, self-reported hypertension (yes, no), and self-reported diabetes (yes, no).
OBS, oxidative balance score; PSA, prostate specific antigen.
In addition, we also assessed the dose–response relationship between OBS and PSA. We found a non-linear relationship between OBS and PSA in the total population (Figure 1, Poverall = 0.020, Pnonlinear = 0.007) and, in the age-specific analyses, it was significant among individuals aged 65 years and older (Figure 2, Poverall = 0.006, Pnonlinear = 0.021), not among individuals aged below 65 years old (Figure 3, Poverall = 0.274, Pnonlinear = 0.153).
Figure 1
Figure 2
Figure 3
Discussion
In the present study, we found that OBS was positively associated with PSA among older adults, after adjusting for other covariates. Meanwhile, we also explored the dose–response relationship between them and found a non-linear relationship between OBS and PSA among older adults.
The results of the study have important implications for both public health and clinical settings, as PC is not only a public health issue but also an important clinical disease. It indicated that physicians should pay attention to reducing oxidative stress, which may be helpful to reduce the level of PSA, and then reduce the occurrence of PC. And from a public health perspective, adequate antioxidant food intake may be helpful for the prevention of PC for men, especially for older adults.
In the subgroup analysis, we found that the association was significant among individuals aged 65 years old and older, but it was not significant among those aged below 65 years old. We believe several factors may contribute to this phenomenon. First, studies have shown that the level of oxidative stress would increase with the increase of age, as the process of aging in the human body itself is accompanied by oxidation of the body (20, 21). Secondly, when the human body is aging, the organ function of the body gradually declines and the absorption capacity of antioxidant is weakened, which could result in the high level of oxidative stress (22, 23).
The mechanism underlying the positive association between OBS and PSA is unclear. The process of oxidative stress is usually induced by the elevation of cellular ROS, and immune function, oxidative metabolism, and mitochondrial bioenergetics could continuously generate ROS (24, 25). It is usually in hypochlorous acid, hydroxyl radical, superoxide anion, and other substances related with cell growth, differentiation, and death (26). Previous studies have reported that several complex cell signaling pathways are involved in the progression and incidence of PC with animal models and cell culture experiments (27). Actually, several factors could cause oxidative free radicals, including delaying the recruitment of p53 and regulating androgens and inflammation (28). And studies have indicated that the increase of ROS accumulation and production in prostate cancer cells was related with serum androgens (29).
There are a few more restrictions that must be mentioned. Firstly, as the study is only cross-sectional, a causal relationship between OBS and PSA cannot be established. Second, we were unable to completely rule out the possibility of unassessed confounders even after adjusting for a variety of plausible risk factors in our investigation. Thirdly, as this study only included adult US citizens, care should be taken when extrapolating the results to other demographics.
Conclusion
In the present study, we found that OBS is positively associated with PSA among older adults, and a nonlinear relationship could also be found between OBS and PSA. Further large-scale prospective cohort studies are needed to verify our findings and explore the association between OBS and PSA.
Statements
Data availability statement
The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding author.
Author contributions
JL: Formal analysis, Methodology, Writing – original draft. CY: Methodology, Validation, Visualization, Writing – original draft. KX: Conceptualization, Software, Supervision, Writing – review & editing.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. The study was supported by Hubei Provincial Health Commission 2018–2019 Traditional Chinese Medicine Research Project (No. ZY2019Q021). The funder did not play any role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; nor in the preparation, review, or approval of the manuscript.
Acknowledgments
We thank the study group of the National Health and Nutrition Examination Survey.
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.
Publisher’s note
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.
Supplementary material
The Supplementary material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fpubh.2023.1336657/full#supplementary-material
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Summary
Keywords
oxidative balance score, prostate specific antigen, older adults, NHANES, association
Citation
Li J, Yang C and Xiang K (2024) Association between oxidative balance score and prostate specific antigen among older US adults. Front. Public Health 11:1336657. doi: 10.3389/fpubh.2023.1336657
Received
11 November 2023
Accepted
26 December 2023
Published
22 January 2024
Volume
11 - 2023
Edited by
Dongming Wang, Huazhong University of Science and Technology, China
Reviewed by
Jinyi Wu, Wuhan Fourth Hospital, China
Jinhua Pan, Zhejiang University, China
Updates
Copyright
© 2024 Li, Yang and Xiang.
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: Kui Xiang, xiangkuieszmzyy@163.com
†These authors share first authorship
Disclaimer
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