RT Journal Article SR Electronic T1 Correction JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 66 OP 66 DO 10.1136/sti.47.1.66 VO 47 IS 1 YR 1971 UL http://sti.bmj.com/content/47/1/66.abstract AB