1. Department of Cariology and Endodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, PR China
2. Department of Periodontology, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, PR China
3. Department of Preventive Stomatology, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, PR China
4. Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, PR China