Low dose thymoglobulin versus basiliximab in cytomegalovirus positive kidney transplant recipients: Effectiveness of preemptive cytomegalovirus modified strategy Camilo Montero; Nancy Yomayusa; Rodolfo Torres; Jorge Cortes; Carlos Alvarez; Juan Gallo; Guillermo Aldana; Andres Acevedo; Maria Rios; Johana Echeverri; Zuly Yepes; Adriana Silva; Diana Gayon; Jorge Perez; Milciades Ibanez;