Tang, Yunhui
Zhu, Chenqi
Zhu, Chen
Liang, Feng
Lee, Arier
Yao, Xiaoying
Chen, Qi
Article History
Received: 4 June 2020
Accepted: 31 August 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: This study was approved by ethic committees of the Hospital of Obstetrics & Gynaecology, Fudan University, China. Ethic Committees of the Hospital of Obstetrics & Gynaecology, Fudan University, China granted permission for data collection from hospital medical database.
: Not applicable.
: None of the authors have a conflict of interest.