1. State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Clinical Research Center for Oral Diseases, Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
2. Department of Stomatology, Xi’an Medical College, Xi'an, Shaanxi 710309, P.R. China
3. Department of Stomatology, PLA Army General Hospital, Beijing 100700, P.R. China
4. State Key Laboratory of Military Stomatology, Department of Operative Dentistry and Endodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
5. Medical Service Management Office, Tangdu Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
6. Research Center of Traditional Chinese Medicine, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
7. State Key Laboratory of Military Stomatology, Department of Periodontology, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
8. Department of Stomatology, The People's Hospital of Tongchuan, Tongchuan 727000, P.R. China