RT Journal Article SR Electronic T1 HPV vaccination to prevent anal cancer in men who have sex with men JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 342 OP 343 DO 10.1136/sextrans-2013-051176 VO 89 IS 5 A1 Mark D Lawton A1 Mayura Nathan A1 David Asboe YR 2013 UL http://sti.bmj.com/content/89/5/342.abstract AB