Chen, Hong
Zhang, Rui
Cheng, Ran
Xu, Ting
Zhang, Tao
Hong, Xiao
Zhao, Xing
Wu, Yunyun
Cheng, Li
Hu, Tao
Funding for this research was provided by:
National Natural Science Foundation of China (81970948)
Scientific Research in the Public Interest under Grant (201502002)
Article History
Received: 15 December 2019
Accepted: 28 April 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: Ethical approvals were obtained from the Stomatological Ethics Committee of the Chinese Stomatological Association and the Ethics Committee of West China Hospital of Stomatology, Sichuan University (Approval No. 2014–003).All adolescents and their statutory guardians were required to sign an informed consent form, the informed consent form contains the survey content about adolescents and their statutory guardians.
: Not applicable.
: The authors declare that they have no competing interests.