Ou, Yu-Lan
Lai, Yue-Rong
Jiang, Chao-Nan
Zhang, Jing
Ding, Zan
Article History
Received: 14 January 2020
Accepted: 12 March 2020
First Online: 20 March 2020
Ethics approval and consent to participate
: This school-based study was approved by the Institutional Review Board of Baoan Central Hospital of Shenzhen, and written informed consents for each student and their parents were obtained.
: Not applicable.
: The authors declare that they have no competing interests.