Xu, Jing
Zhou, Guanghua
Li, Yanpei
Li, Na
Article History
Received: 9 July 2019
Accepted: 14 November 2019
First Online: 11 December 2019
Ethics approval and consent to participate
: The study was approved by the Research Ethics Committee of China Emergency General Hospital and informed consent was obtained from every guardian of child participated in the study.
: Not applicable.
: The authors declare that they have no competing interests.