1. Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China.
2. Nanjing Key Laboratory, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China.
3. Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China.