1. Periodontology and Implant Dentistry, Faculty of Dentistry The University of Hong Kong Hong Kong SAR China
2. Department of Medicine and Rehabilitation, Integrated Diabetes Mellitus Research and Training Centre Tung Wah Eastern Hospital, Hospital Authority Hong Kong SAR China
3. Department of Prosthodontics, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology Sichuan University Chengdu China