Chen, Shanquan
Chen, Xi
Law, Stephen
Lucas, Henry
Tang, Shenlan
Long, Qian
Xue, Lei
Wang, Zheng
Funding for this research was provided by:
National Health and Family Planning Commission of the People's Republic of China
Article History
Received: 18 May 2020
Accepted: 19 October 2020
First Online: 4 November 2020
Ethics approval and consent to participate
: De-identified public data is used in this study. No ethical issues arise.
: Not applicable.
: The authors declare that they have no conflicts of interest.