RT Journal Article SR Electronic T1 DISCUSSION JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 89 OP 91 DO 10.1136/sti.33.2.89 VO 33 IS 2 YR 1957 UL http://sti.bmj.com/content/33/2/89.abstract AB