1. Department of Oral Medicine, Haizhu Square Branch, Stomatological Hospital, Southern Medical University (Guangdong Provincial Stomatological Hospital), Guangzhou, Guangdong 510280, P.R. China
2. Zhujiang New Town Dental Clinic, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat‑Sen University, Guangzhou, Guangdong 510060, P.R. China