Chen, Ruizhe
Fu, Yunfeng
You, Bingbing
Li, Ying
Yao, Yeli
Wang, Xinyu
Cheng, Xiaodong
Article History
Received: 2 June 2021
Accepted: 8 November 2021
First Online: 15 November 2021
Declarations
:
: This study was approved by the ethics committee of the Women’s Hospital, Zhejiang University School of Medicine (PRO2021-1292). This article does not contain any studies with animals performed by any of the authors. Furthermore, the consent of the study participants was deemed unnecessary as the study only concerned the retrospective review of the medical database. The need of informed consent was waived by the ethics committee {Medical Ethics Committee of the Women’s Hospital, Zhejiang University School of Medicine} for this retrospective study. We confirm that all methods were performed in accordance with the 1964 Declaration of Helsinki and its later amendments.
: Not applicable.
: The authors declare that they have no competing interests.