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 57 OP 68 DO 10.1136/sti.32.1.57 VO 32 IS 1 YR 1956 UL http://sti.bmj.com/content/32/1/57.abstract AB