1. Department of Otorhinolaryngology, Qilu Hospital, Shandong University, Key Laboratory of Otolaryngology, Ministry of Health, Shandong, P. R. China
2. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Head and Neck surgery, Peking University Cancer Hospital & Institute, Beijing, China
3. Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA