1. Departments of Pediatrics; Pathology and Medicine; McMaster University and McMaster Children's Hospital; Hamilton Ontario Canada
2. Unidad Nacionál de Oncologiá Pediátrica; Guatemala City Guatemala
3. Department of Hematology-Oncology; Hospital de Manuel de Jesús Rivera “La Mascota”; Managua Nicaragua
4. Department of Pediatric Oncology; Benjamin Bloom Hospital; San Salvador El Salvador
5. Hospital del Niño; Panama City Panama
6. Service of Hematology; Dr. Carlos Saenz Herrera National Children's Hospital; San Jose Costa Rica
7. Department of Hematology-Oncology; Children's Hospital Robert Reid Cabral; Santo Domingo Dominican Republic
8. Department of Hematology-Oncology; Hospital Escuela Universitario; Tegucigalpa Honduras
9. Department of Pediatrics; University of Milano-Bicocca; Fondazione MB BM Monza Italy
10. Department of Pediatrics; University of Illinois College of Medicine; Peoria Illinois
11. International Outreach Program; St. Jude Children's Research Hospital; Memphis Tennessee
12. Dana Farber/Boston Children's Center for Cancer and Blood Disorders; Boston Massachusetts
13. Department of Health Sciences; University of Milano-Bicocca; Monza Italy
14. Consorzio Maria Negri Sud; Santa Maria Imbaro Italy
15. Oncology Institute of Southern Switzerland; Bellinzona Switzerland