RT Journal Article SR Electronic T1 History of Syphilis JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 245 OP 245 DO 10.1136/sti.69.3.245 VO 69 IS 3 A1 RS Morton YR 1993 UL http://sti.bmj.com/content/69/3/245.abstract AB