1. Department of Head and Neck Surgery, Sichuan Cancer Hospital, Chengdu, China
2. Department of Head and Neck surgery, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), 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
4. Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
5. Department of Radiology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
6. Department of Otorhinolaryngology Head & Neck Surgery, China-Japan Friendship Hospital, Beijing, China