1. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of Operative Dentistry and Endodontics, School of Stomatology, the Fourth Military Medical University, Xi'an, China.
2. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of VIP Dental Care, and School of Stomatology, the Fourth Military Medical University, Xi'an, China.
3. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of Medical Rehabilitation, School of Stomatology, the Fourth Military Medical University, Xi'an, China.