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 73 OP 79 DO 10.1136/sti.53.1.73 VO 53 IS 1 YR 1977 UL http://sti.bmj.com/content/53/1/73.abstract AB