1. Department of Stomatology, The Second Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China.
2. School of Mathematics and Physics, Anqing Normal University, Anqing, People's Republic of China.
3. Department of Orthodontics, Shanghai Key Laboratory of Stomatology, Shanghai No. 9 Hospital, Shanghai Jiaotong University School of Medical, Shanghai, People's Republic of China.
4. School of Medical Information Engineering, Anhui University of Chinese Medicine, Hefei, People's Republic of China.