Development and validation of a staging system for HPV-related oropharyngeal cancer by the International Collaboration on Oropharyngeal cancer Network for Staging (ICON-S): a multicentre cohort study. - O'Sullivan, Brian; Huang, Shao Hui; Su, Jie; Garden, Adam S; Sturgis, Erich M; Dahlstrom, Kristina; Lee, Nancy; Riaz, Nadeem; Pei, Xin; Koyfman, Shlomo A; Adelstein, David; Burkey, Brian B; et al. (Lancet Oncology, 2016)