1. Pediatric Hematology / Oncology Fellowship Program; St. Jude Children's Research Hospital; Memphis Tennessee
2. Department of Hematology/Oncology; Children's Hospital Manuel de Jesus Rivera; Managua Nicaragua
3. Department of Nutrition; Children's Hospital Manuel de Jesus Rivera; Managua Nicaragua
4. Department of Hematology/Oncology; Stem Cell Transplantation, and Cancer Biology; Stanford University; Stanford California