1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610065, China
2. Department of Oral Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610065, China
3. Department of Stomatology, Medical College of Soochow University, Suzhou, Jiangsu Province 215123, China