RT Journal Article SR Electronic T1 Sexually transmitted diseases JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 281 OP 281 DO 10.1136/sti.63.4.281 VO 63 IS 4 A1 R S Pattman YR 1987 UL http://sti.bmj.com/content/63/4/281.1.abstract AB