Affiliation: | 1. Department of Oral and Maxillofacial Surgery, 2nd Affiliated Hospital of Jiamusi University, Jiamusi City, Heilongjiang, People's Republic of China;2. Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, People's Republic of China;3. Department of Plastic and Reconstructive Surgery, 2nd Affiliated Hospital of Jiamusi University, Jiamusi City, Heilongjiang, People's Republic of China |