RT Journal Article SR Electronic T1 The Evolutionary Cycle of the Treponematoses JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 78 OP 91 DO 10.1136/sti.36.2.78 VO 36 IS 2 A1 Willcox, R. R. YR 1960 UL http://sti.bmj.com/content/36/2/78.abstract AB