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 200 OP 204 DO 10.1136/sti.33.3.200 VO 33 IS 3 YR 1957 UL http://sti.bmj.com/content/33/3/200.abstract AB