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Authors
Xue, Yang
Yang, Chun-Feng
Ao, Yu
Qi, Ji
Jia, Fei-Yong
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Article History
Received: 25 March 2020
Accepted: 20 August 2020
First Online: 4 September 2020
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.
