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Authors
Chen, He
Hu, Hongwei
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71403005)
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Article History
Received: 19 October 2017
Accepted: 5 April 2018
First Online: 11 April 2018
Ethics approval and consent to participate
: The data used in our research is secondary data. The survey of the data named “CLHLS” already obtained the ethical approval and informed consent, and was approved by research ethics committees of Duke University and Peking University (IRB00001052–13074). The data used in this study was anonymised before its use.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
