RT Journal Article SR Electronic T1 Human papillomavirus in head and neck cancer JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 370 OP 370 DO 10.1503/cmaj.130849 VO 186 IS 5 A1 David A. Palma A1 Anthony C. Nichols YR 2014 UL http://www.cmaj.ca/content/186/5/370.abstract AB