1. Department of Otorhinolaryngology Head and Neck Surgery, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
2. Department of Oral and Maxillofacial Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, Liaoning 110032, P.R. China
3. Department of Otorhinolaryngology Head and Neck Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, Liaoning 110032, P.R. China