https://orcid.org/0000-0002-7603-3824
About the Authors
- Zhen Zhang
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Roles Conceptualization, Formal analysis, Software, Writing – original draft, Writing – review & editing
Affiliation Institute of Population Research, School of Social Development and Public Policy, Fudan University, Shanghai, P. R. China
- Qiang Li
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Roles Conceptualization, Formal analysis, Writing – original draft, Writing – review & editing
* E-mail: qli@soci.ecnu.edu.cn
Affiliation Population Research Institute, School of Social Development, East China Normal University, Shanghai, P. R. China
Competing Interests
The authors have declared that no competing interests exist.