Liang, Feng
Lin, Yun
Li, Ling
Yang, Chuanzi
Li, Xiaojun
Li, Kuanrong
Article History
Received: 31 May 2022
Accepted: 9 January 2023
First Online: 19 January 2023
Declarations
:
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and was approved by the ethics committees of Guangzhou Women and Children’s Medical Center. The need for informed consents was waived by the ethics committees Review Board of Guangzhou Women and Children’s Medical Center, because of the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.