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Authors
Wang, Qian
Xu, Lingzhong
Sun, Long
Li, Jiajia
Qin, Wenzhe
Ding, Gan
Zhang, Jiao
Zhu, Jing
Xie, Su
Yu, Zihang
Zhou, Chengchao
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71673169, 71673170)
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Article History
Received: 25 January 2018
Accepted: 6 November 2018
First Online: 22 November 2018
Ethics approval and consent to participate
: The institutional review board of the Chinese National Bureau of Statistics provided review and ethics approval of the survey (license number 2013(71)). All respondents were read a statement that explained the purpose of the survey and gave consent to continue.
: Consent for publication was obtained from the participants.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
