1. Division of Haematology/Oncology; The Hospital for Sick Children; Toronto Ontario Canada
2. McMaster Children's Hospital; Hamilton Ontario Canada
3. National Pediatric Oncology Unit; Guatemala City Guatemala
4. Pediatric Oncology; Benjamin Bloom National Children's Hospital; San Salvador El Salvador
5. Pediatric Oncology; Hospital Escuela; Tegucigalpa Honduras
6. Hospital Mario Catarino Rivas; San Pedro Sula Honduras
7. St. Jude Children's Research Hospital; Memphis Tennessee