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 41 OP 56 DO 10.1136/sti.29.1.41 VO 29 IS 1 YR 1953 UL http://sti.bmj.com/content/29/1/41.abstract AB