Xie, Long
Sang, Lei
Li, Zhi
Article History
Received: 22 July 2021
Accepted: 17 September 2021
First Online: 23 September 2021
Declarations
:
: The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Ethics Committee of School and Hospital of Stomatology, Wuhan University (approval number 2019-B11). Each parent signed an informed consent in the study.
: Not applicable.
: The authors declare no conflict of interest.