RT Journal Article SR Electronic T1 The British Co-operative Clinical Group (BCCG) JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 4 OP 5 DO 10.1136/sti.76.1.4 VO 76 IS 1 A1 Michael Waugh YR 2000 UL http://sti.bmj.com/content/76/1/4.abstract AB