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 77 OP 86 DO 10.1136/sti.45.1.77 VO 45 IS 1 YR 1969 UL http://sti.bmj.com/content/45/1/77.abstract AB