1. Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, 100730, China
2. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Head and Neck surgery, Peking University Cancer Hospital & Institute, Houston, TX 77030, USA
3. Department of Head and Neck Surgery, Houston, TX 77030, USA
4. Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA