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 280 OP 285 DO 10.1136/sti.40.4.280 VO 40 IS 4 YR 1964 UL http://sti.bmj.com/content/40/4/280.abstract AB