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 217 OP 220 DO 10.1136/sti.51.3.217 VO 51 IS 3 YR 1975 UL http://sti.bmj.com/content/51/3/217.abstract AB