Xie, Chengmao
Lu, Chang
Liu, Yong
Liu, Zhaohui
Article History
Received: 1 February 2022
Accepted: 6 May 2022
First Online: 18 May 2022
Declarations
:
: All procedures were approved by the ethics review committee of Beijing Obstetrics and Gynecology Hospital. All methods were carried out in accordance with relevant guidelines and regulations of the ethics review committee of Beijing Obstetrics and Gynecology Hospital, and informed consent was obtained from all subjects and/or their legal guardian(s).
: Not applicable.
: The authors declare that they have no competing interests.