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 150 OP 158 DO 10.1136/sti.40.2.150 VO 40 IS 2 YR 1964 UL http://sti.bmj.com/content/40/2/150.abstract AB