Publication Clinical and serologic studies with reference to syphilis in Guatemala, Central America. III. Studies of comparative performance of the Kahn, Kolmer, Mazzini, and VDRL slide tests among leprosy patients. PORTNOY J, GALVEZ R, CUTLER J C. American journal of syphilis, gonorrhea, and venereal diseases. 1952; 36 (6) : 566-70.