Xie, Meng
Feng, Yu
Zhang, Xuyin
Hua, Keqin
Ren, Yunyun
Wang, Wenping http://orcid.org/0000-0002-0467-5916
Funding for this research was provided by:
the fund for scientific research of Chinese Preventive Medicine Association (grant no.201809031)
Article History
Received: 12 July 2018
Accepted: 2 October 2018
First Online: 25 October 2018
Compliance with ethical standards
:
: We declare that we have no conflicts of interest.
: The study design and protocol were approved by the Institutional Review Board of the Obstetrics and Gynecology Hospital of Fudan University, Shanghai, P. R. China. In addition, all patients gave written informed consent after the procedure was explained fully.