About the Authors
- Xueyan Yang
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* E-mail: xueyanyang@mail.xjtu.edu.cn
Affiliation School of Public Policy and Administration and Shaanxi Laboratory for Population and Development Research, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China
- Shuzhuo Li
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Affiliation School of Public Policy and Administration and Shaanxi Laboratory for Population and Development Research, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China
- Marcus W. Feldman
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Affiliation Morrison Institute for Population and Resource Studies, Stanford University, Stanford, California, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: XY SL. Performed the experiments: XY. Analyzed the data: XY. Contributed reagents/materials/analysis tools: SL MWF. Wrote the paper: XY SL MWF.