1 Department of Cranio-Maxillofacial Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China.
2 Department of Gastrointestinal Surgery, Ningbo Municipal Hospital of T.C.M, Ningbo, China.
3 Department of Cranio-Maxillofacial Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China. Electronic address: [email protected].