Liu, Bingqing
Song, Lulu
Li, Hui
Zheng, Xiaoxuan
Yuan, Jing
Liang, Yuan
Wang, Youjie http://orcid.org/0000-0001-7031-2972
Funding for this research was provided by:
National Natural Science Foundation of China (81273083)
Fundamental Research Funds for the Central Universities (2014TS051)
Hubei Province Health & Family Planning Scientific Research Project (WJ2015MA026)
Article History
Received: 4 January 2018
Accepted: 5 March 2018
First Online: 15 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the Medical Ethics Committee of School of Public Health, Tongji Medical School.
: Signed informed consent was obtained from all participants included in this study.