Zhang, Mingming
Zheng, Yang
Li, Xiaohui
Yang, Shuai
Shi, Lin
Li, Aijie
Liu, Yang
Article History
Received: 4 February 2020
Revised: 14 April 2021
Accepted: 22 April 2021
First Online: 21 May 2021
Competing interests
: The authors declare no competing interests.
: Parental/guardian consent was obtained.
: All procedures regarding this work comply with the ethical standards of the relevant national guidelines on human experimentation and with the Declaration of Helsinki, as revised in 2008. The study was approved by the Ethics Committee of the Capital Institute of Pediatrics (No. SHERLL 2015040).