1. State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
2. Department of Oral Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
3. Department of General Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
4. Jinjiang Out-Patient Section, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China