About the Authors
- Xiaoyun Liang
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Affiliation School of Social Development and Public Policy, Beijing Normal University, Beijing, China
- Hong Guo
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Affiliation School of Social Development and Public Policy, Beijing Normal University, Beijing, China
- Chenggang Jin
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Affiliation School of Social Development and Public Policy, Beijing Normal University, Beijing, China
- Xiaoxia Peng
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* E-mail: niuniu@ccmu.edu.cn (XP); Zhang99@bnu.edu.cn (XZ)
Affiliation School of Public Health and Family Medicine, Capital Medical University, Beijing, China
- Xiulan Zhang
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* E-mail: niuniu@ccmu.edu.cn (XP); Zhang99@bnu.edu.cn (XZ)
Affiliation School of Social Development and Public Policy, Beijing Normal University, Beijing, China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: XL XP CJ XZ. Analyzed the data: XL XP. Contributed reagents/materials/analysis tools: XL XP. Wrote the paper: XL. Literature review: XL. Acquisition of data: XL HG. Data extraction: XL HG. Critical revision of the manuscript: XP XZ CJ.