Zhu, Ru
Duan, Hua
Xu, Wenbin
Wang, Sha
Gan, Lu
Xu, Qian
Li, Jinjiao
Article History
Received: 28 February 2021
Accepted: 28 December 2021
First Online: 29 January 2022
Declarations
:
: Ethics approval was granted by the Institutional Review Board of the Beijing Obstetrics and Gynecology Hospital (Reference No. June 2014). Informed consent was obtained from all subjects. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.