Zhang, Tingting
Wang, Guoxing
Cao, Zheng
Huang, Wenyang
Xiao, Hongli
Wei, Hongtao
Lu, Junli
Liu, Ruixia
Yin, Chenghong
Article History
Received: 11 October 2021
Accepted: 3 May 2022
First Online: 17 May 2022
Declarations
:
: I confirm that all methods were performed in accordance with the relevant guidelines and regulations by including a statement in the Ethics approval and consent to participate section to this effect.The study was approved by the institutional review board of the Beijing Obstetrics and Gynecology Hospital. The records and data did not include potential patient identifying information, so informed consent was not required.The Beijing Obstetrics and Gynecology Hospital has approved the waiver for need for informed consent.
: Consent for publication is not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.