You, Wenzhe
Hao, Aimin
Li, Shuai
Wang, Yong
Xia, Bin
Funding for this research was provided by:
Capital Health Research and Development of Special
Article History
Received: 8 January 2020
Accepted: 14 April 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Ethics approval for the study was obtained from the Health Research Ethics Committee of the Peking University School and Hospital of Stomatology (Protocol: PKUSSIRB-201837095). Informed consent forms to guardians of children participating in this research were requested and signed.
: Not applicable.
: The authors declare that they have no competing interests.