Funding for this research was provided by:
the National Natural Science Foundation of China (81625005 to Z.P.F.)
CAMS Innovation Fund for Medical Sciences (2019-I2M-5-031 to Z.P.F.)
Received: 17 June 2020
Accepted: 9 November 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: This study was approved by Medical Ethics Committee of Beijing Stomatological Hospital, Capital Medical University. All procedures were explained to patients, the written informed consent was signed by the patients or their parents.
: Not applicable.
: The authors declare that there are no potential conflicts of interest.