Song, Linhong
Meng, Qiang
Liu, Changgen
Wang, Gang
Wang, Hui
Zhou, Gengxu
Feng, Zhichun
Funding for this research was provided by:
Military Family Planning Special Research Project (20JSZ15)
Article History
Received: 17 April 2023
Accepted: 16 November 2023
First Online: 21 November 2023
Declarations
:
: The Ethics This study was approved by the research ethics board of the Seventh Medical Center of Chinese PLA General Hospital (2023-34). Informed consent was waived by the research ethics board of the Seventh Medical Center of Chinese PLA General Hospital (2023-34) because of the retrospective design of the study. This study protocol follows the principle stated in the Declaration of Helsinki.
: Not applicable.
: The authors declare there are no competing interests.