Cheng, Guangyan
Hu, Yuanjing
Gong, Yingying
Article History
Received: 10 June 2022
Accepted: 16 November 2022
First Online: 6 December 2022
Declarations
:
: Our study was conducted by Helsinki Declaration principles. This study was approved by the Ethics Committee of Tianjin Central Hospital of Gynecology and Obstetrics. The Ethics Committee of Tianjin Central Hospital of Gynecology and Obstetrics stated that the requirement for informed consent was waived in this study.
: Not applicable.
: The authors declare no competing interests.