Gao, Li-Na
Hao, Man
Liu, Xiao-Hui
Zhang, Li
Dong, Yan
Zhang, Yu-Fang
He, Xiao-Chun
Article History
Received: 17 June 2021
Accepted: 27 October 2021
First Online: 17 November 2021
Declarations
:
: The study was approved by the Medical Ethical Committee of Gansu Provincial Maternity and Child-care Hospital.
: Not applicable.
: The authors declare that there is no conflict of interests regarding the publication of this paper.