1. State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases and Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology Sichuan University Chengdu China
2. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry Ibb University Ibb Yemen
3. Department of Orthodontics, School of Stomatology Lanzhou University Lanzhou China
4. Department of Epidemiology and Health Statistics, West China School of Public Health and West China Fourth Hospital Sichuan University Chengdu China
5. Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology Sun Yat‐sen University Guangzhou China