1. State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral Diseases, West China Hospital of Stomatology Chengdu China
2. Department of Oral ProsthodonticsWest China Hospital of Stomatology, Sichuan University Chengdu Sichuan China
3. Department of Oral OrthodonticsWest China Hospital of Stomatology, Sichuan University Chengdu Sichuan China
4. Department of Restorative DentistrySchool of Dentistry, University of Washington Seattle WA