Du, Boran
Shi, Xiangjun
Yin, Chenghong
Feng, Xin
Funding for this research was provided by:
Beijing Obstetrics and Gynecology Hospital, Capital Medical University (FCYY201819)
Article History
Received: 20 November 2018
Accepted: 2 May 2019
First Online: 28 June 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.