TY - JOUR T1 - Primary and secondary syphilis. Country of origin study, 1968. British Cooperative Clinical Group. JF - The British Journal of Venereal Diseases JO - Br J Vener Dis SP - 69 LP - 75 DO - 10.1136/sti.46.1.69 VL - 46 IS - 1 A2 - , Y1 - 1970/02/01 UR - http://sti.bmj.com/content/46/1/69.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -