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 341 OP 350 DO 10.1136/sti.45.4.341 VO 45 IS 4 YR 1969 UL http://sti.bmj.com/content/45/4/341.abstract AB