1. Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Harbin Medical University, School of Stomatology, Harbin 150001, Heilongjiang, China
2. Key Laboratory of Hepatosplenic Surgery, Ministry of Education, Harbin 150001, Heilongjiang, China
3. Department of Orthodontics, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang, China