Wu, Qiong
Mei, May Lei http://orcid.org/0000-0002-2663-4576
Wu, Xin
Shi, Shuya
Xu, Yuting
Chu, Chun Hung
Chen, Yaming
Article History
Received: 1 October 2019
Accepted: 6 February 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: Ethical approval was obtained from Ethics Committee of the School and Hospital of Stomatology, Nanjing Medical University (2019–284). This study was conducted in full accordance with the Declaration of Helsinki of the World Medical Association. All participants received dental treatment at the Hospital of Stomatology of Nanjing Medical University and provided written informed consent. The written consents were obtained from the parents/guardians of the teenagers who were under 16 years of age.
: Not applicable.
: The authors declare that they have no competing interests.