Received: 15 November 2021
Accepted: 12 April 2022
First Online: 3 May 2022
: The study protocol was documentarily approved by the Ethics Committee of Peking University School of Stomatology (No. PKUSSIRB-20183912) and was conducted in accordance with the Helsinki Declaration of 1975, as revised in 2000.
: Not applicable.
: The authors declare that they have no competing interests.