1. Department of Periodontology, State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Engineering Research Center for Dental Materials and Advanced Manufacture, 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 Key Laboratory of Oral Diseases, Center for Tissue Engineering Fourth Military Medical University Xi’an China
3. Doctoral students of eight-year program The Fourth Military Medical University Xi’an China
4. Department of Orthodontics, State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, School of Stomatology The Fourth Military Medical University Xi’an China