RT Journal Article SR Electronic T1 Web Top 10 JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 97 OP 97 DO 10.1136/sti.79.2.97 VO 79 IS 2 YR 2003 UL http://sti.bmj.com/content/79/2/97.abstract AB