Wang, Xiaoli
Li, Haiyuan
Zhang, Qianqian
Shen, Qianwen
Zhu, Dan
Li, Hong
Tang, Zheng
Zhao, Jiuru
Liu, Zhiwei
Article History
Received: 7 November 2020
Accepted: 17 February 2021
First Online: 1 March 2021
Declarations
:
: The study was approved by the International Peace Maternity and Child Health Hospital’s committee on human research. The ethics approval number is (GKLW) 2016–21. Informed consents had been obtained from the parents of all subjects in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.