Wang, Yuqi
Chen, Minne
Tan, Shihui
Qu, Xueqi
Wang, Hanyu
Liang, Xiao
Gaoshan, Junjian
Li, Lihe
Hong, Ping
Jiang, Li
Tang, Kun http://orcid.org/0000-0002-5444-186X
Funding for this research was provided by:
China Family Planning Association (NA)
Article History
Received: 10 October 2019
Accepted: 9 August 2020
First Online: 17 August 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Peking University Health Science Centre Institutional Review Boards. All participants provide written consents.
: Not applicable.
: The authors declare that they have no competing interests.