1. Department of Hematology, Hospital de Enfermedades de la Nutrición, Mexico, D.F., and the University of Puebla, Puebla, Mexico.
2. Department of Hematology, Hospital (IC Enfermedades de la Nutricón, Mexico, D. F.
3. Hospital (IC Enfermedades de la Nutricón, Assistant Professor, Graduate Course of hematology, National University of Mexico, Mexico, D. F.