Funding for this research was provided by:
Wuhan health and Family Planning Commission research projects (WG15A02 and WX18 Q31)
Article History
Received: 30 June 2020
Revised: 16 July 2020
Accepted: 4 August 2020
First Online: 13 August 2020
Compliance with ethical standards
:
: None.
: Not applicable.
: Not applicable.
: Not applicable
: Not applicable.