Chen, Xinguang
Sun, Yang
Li, Zhi
Yu, Bin
Gao, Ge
Wang, Peigang
Funding for this research was provided by:
National Natural Science Foundation of China (71573192, 71303012)
Humanities and Social Sciences Project of China Ministry of Education (17YJCZH155)
Article History
Received: 11 January 2018
Accepted: 24 August 2018
First Online: 31 August 2018
Compliance with ethical standards
:
: None of the authors has a conflict of interest associated with the reported research.
: The data sets generated and/or analyzed during the current study are available in the NHFPC (National Health and Family Planning Commission of the People’s Republic of China) repository,ExternalRef removed, and published on Annual <i>China Health Statistical Yearbook</i>, which renamed as <i>China Health and Family Planning Statistics Yearbook</i> from year 2014.