1. Department of Orthodontics, Tianjin Stomatological Hospital, School of Medicine, Nankai University, Tianjin, China.
2. Department of Stomatology, Tianjin Medical University, Tianjin, China.
3. Tianjin Key Laboratory of Oral and Maxillofacial Fuction Reconstruction, Tianjin Stomatological Hospital, Tianjin, China.