1. Departments of Experimental Hematology and Physiopathology, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela and Department of Anthropology, University of California, Los, Angeles, California.
2. Department of Experimental Hematology, Instituto Venezolano de Investigaciones Científicas, and Associate Professor of Medicine, Universidad Central, Caracas, Venezuela
3. Department of Experimental Hematology, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela
4. Department of Physiopathology, Instituto Venezolano de Investigaciones Científlcas and Professor of Medicine, Universidad Central, Caracas, Venezuela.
5. University of California, Los Angeles.
6. Department of Anthropology, University of California, Los Angeles.