Xue, Yang
Zhang, Zhen
Sheng, Chu-Qiao
Li, Yu-Mei
Jia, Fei-Yong
Article History
Received: 8 July 2019
Accepted: 18 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: The study was approved by the institutional ethics committee of the hospital, the First Hospital of Jilin University (ChiCTR1800020196). The parents or guardians of the eligible children provided written informed consent. An information sheet was provided for the parents or guardians of all the participants.
: Not applicable.
: The authors declare that they have no competing interests.