Liang, Xiaohua
Tang, Xian
Xi, Bo
Qu, Ping
Ren, Yanling
Hao, Guang
Article History
Received: 29 October 2021
Revised: 22 February 2022
Accepted: 29 March 2022
First Online: 18 April 2022
Competing interests
: The authors declare no competing interests.
: This study was approved by the Institutional Review Board of Chongqing Medical University and written informed consent was obtained from parents or guardians and each child before their recruitments.