Affiliation: | 1. Department of Oral Maxillofacial Surgery, The First Affiliated Hospital, Harbin Medical University, Harbin, China;2. Department of Medical, The Second Affiliated Hospital, Harbin Medical University, Harbin, China;3. Department of Stomatology, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, China;4. Department of Stomatology, Harbin Children's Hospital, Harbin, China |