Gao, Li
Xu, Qian-Qian
Wang, Shan
Xia, Yuan-Qing
Zhao, Xin-Rong
Wu, Yi
Hua, Ren-Yi
Sun, Jin-Ling
Wang, Yan-Lin
Article History
Received: 20 December 2021
Accepted: 12 May 2022
First Online: 18 May 2022
Declarations
:
: The research related to studies with human subjects was compiled with all the relevant national regulations and institutional policies and is in accordance with the tenets of the Helsinki Declaration. The study was approved by the Medical Ethics Committee of the International Peace Maternity & Child Health Hospital (Approval No. 2015–62). Informed consent was waived due to the retrospective design of the study.
: Not applicable.
: The authors declare that they have no competing interests.