1. Department of Stomatology, Beijing YouAn Hospital; Capital Medical University; Beijing 100069 People's Republic of China
2. Department of Stomatology; The First People's Hospital of Changde; Changde 415003 People's Republic of China
3. Department of Oral and Maxillofacial Surgery, Xiangya Hospital; Central-South University; Changsha 410008 People's Republic of China
4. State Key Laboratory of Medical Genetics; Central South University; Changsha 410078 People's Republic of China