1. Department of Otolaryngology Head and Neck Surgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116027, P.R. China
2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, Liaoning 116023, P.R. China
3. Department of Oncology, The 210th Hospital of PLA, Dalian, Liaoning 116000, P.R. China