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 482 OP 486 DO 10.1136/sti.49.5.482 VO 49 IS 5 YR 1973 UL http://sti.bmj.com/content/49/5/482.abstract AB