Funding for this research was provided by:
National Natural Science Foundation of China (81670996)
Nanjing Medical Science and technique Development Foundation (QRX17025, QRX17081)
Received: 11 April 2020
Accepted: 9 November 2020
First Online: 20 November 2020
Ethics approval and consent to participate
: The study protocol was evaluated and approved by the local ethics committee (Nanjing Stomatological Hospital, Medical School of Nanjing University, No. 2019NL-064(KS)). Written consent was obtained from participants or their parents (for participants less than 16 years old).
: Not applicable.
: The authors declare that they have no competing interests.