RT Journal Article SR Electronic T1 Abstracts JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 192 OP 202 DO 10.1136/sti.31.3.192 VO 31 IS 3 YR 1955 UL http://sti.bmj.com/content/31/3/192.abstract AB