1. Department of Otorhinolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
2. Department of Otorhinolaryngology, Head and Neck Surgery, The Fifth Affiliated Hospital of Harbin Medical University, Daqing, China
3. Department of Head and Neck Surgery, The Oncology Hospital of Jilin province, Changchun, China
4. Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, University of California, Los Angeles, California, USA
5. Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China