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 219 OP 226 DO 10.1136/sti.48.3.219 VO 48 IS 3 YR 1972 UL http://sti.bmj.com/content/48/3/219.abstract AB