Liu, Yang
Li, Zheng-feng
Zhong, Yun-huan
Zhao, Zhi-hui
Deng, Wen-xin
Chen, Ling-ling
Liu, Bei-bei
Du, Tao-jun
Zhang, Yong
Article History
Received: 20 January 2021
Accepted: 20 May 2021
First Online: 9 June 2021
Declarations
:
: This study was reviewed and approved by the hospital’s medical ethics committee of Sichuan Provincial Maternity and Child Health Care Hospital, and informed consent was obtained from the parents of all children. The verbal informed consent was obtained from the parents of all children, the ethics committee approved this procedure.
: Not applicable.
: The authors declare that they have no competing interests.