Hua, Li
Chen, Qian
Liu, Quan-Hua
Guo, Yi-Feng
Cheng, Ru-Hong
Zhang, Jun
Zhang, Jian-Hua
Wang, Li-Wei
Ji, Ruo-Xu
Article History
Received: 20 April 2021
Accepted: 30 June 2021
First Online: 14 July 2021
Declarations
:
: Written informed consent was obtained from parents and / or legal guardians for all the subjects who are under 16. This study was approved by the Ethics Committees of the two participating hospitals, Xinhua Hospital and the International Peace Maternity & Child Health Hospital (approval number: XHEC-C-2012-003), and conducted according to the principles in the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.