RT Journal Article SR Electronic T1 Commentary JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 121 OP 121 DO 10.1136/sti.2007.028423 VO 84 IS 2 A1 D Barlow YR 2008 UL http://sti.bmj.com/content/84/2/121.abstract AB