1. Universidad de Carabobo and Iberoamerican Cochrane Network; Valencia Edo. Carabobo Venezuela
2. Institute of Oncology, Fundación Santa Fe de Bogotá; Clinical and Translational Oncology Group; Calle 119 No. 7 - 75 Bogotá Cundinamarca Colombia 0571
3. National Cancer Institute of Colombia; Hematology and Bone Marrow Transplantation Department; Calle 1a No. 9-85, piso 4 Bogota Colombia