Yue, Chao-yan
Gao, Jiang-ping
Zhang, Chun-yi
Ni, Ying-hua
Ying, Chun-mei
Article History
Received: 7 August 2020
Revised: 31 August 2020
Accepted: 11 September 2020
First Online: 15 October 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The present study conformed to the principles of the Declaration of Helsinki. Approval was obtained from the Research Ethics Committee of the Obstetrics & Gynecology Hospital of Fudan University (approval number: 2019-06).