RT Journal Article SR Electronic T1 Sexually transmitted diseases JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 280 OP 280 DO 10.1136/sti.63.4.280 VO 63 IS 4 A1 GD Morrison YR 1987 UL http://sti.bmj.com/content/63/4/280.1.abstract AB