Xu, Chuangchuang
Guo, Ying
Chi, Xiaolei
Chen, Yiyao
Chu, Lei
Chen, Xinliang
Article History
Received: 24 October 2022
Accepted: 3 January 2023
First Online: 9 January 2023
Declarations
:
: This study was performed in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the International Peace Maternity and Child Health Hospital in Shanghai. The requirement for informed consent was waived by the Ethics Committee of the International Peace Maternity and Child Health Hospital in Shanghai because of the retrospective nature of the study.
: Not applicable.
: All authors declare no competing interests.