Derivation and validation of the AJCC9V pathological stage classification for HPV-positive oropharyngeal carcinoma: a multicentre registry analysis.

Ho AS, Huang SH, O'Sullivan B, Luu M, Evans M, Ferris RL, Lewis JS, Seethala RR, Yom SS, Mehanna H, Branstetter BF, Saba NF, Patel SG, Lydiatt WM, Zumsteg ZS