1. Jiangsu Key Laboratory of Oral Diseases; Nanjing Medical University; Nanjing China
2. Department of Orthodontics; Affiliated Hospital of Stomatology; Nanjing Medical University; Nanjing China
3. Department of Endodontics; Affiliated Hospital of Stomatology; Nanjing Medical University; Nanjing China
4. Dental Health Services Research Unit; University of Dundee; Dundee UK
5. Department of Polyclinics; Affiliated Hospital of Stomatology; Nanjing Medical University; Nanjing China
6. Department of Education; Affiliated Hospital of Stomatology; Nanjing Medical University; Nanjing China
7. Department of Prosthodontics; Affiliated Hospital of Stomatology; Nanjing Medical University; Nanjing China