H. Cruz-Bermúdez, S. Forero-Rincon, and J. Moreno-Collazos, “Reactivity to Treponema pallidum in blood donors, Ibagué, Colombia, 2011”, Rev Peru Med Exp Salud Publica, vol. 29, no. 4, Feb. 2014, doi: 10.17843/rpmesp.2012.294.414.