1. Department of Orthodontics, School of Stomatology, the Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.
2. Research and Development Center for Tissue Engineering, the Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.
3. Department of Orthodontics, Tianjin Stomatological Hospital, NanKai University, Tianjin, People's Republic of China.
4. Department of Oral Histology and Pathology, the Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.
5. Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.
6. Department of Cardiology, Xijing Hospital, the Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.