1. Division of Hematology/Oncology; Department of Pediatrics; Stanford University School of Medicine; Palo Alto California
2. Stanford University School of Medicine; Palo Alto California
3. Unidad Nacional de Oncología Pediátrica; Guatemala City Guatemala
4. Division of Pediatric Hematology/Oncology; Department of Pediatrics; UCSF Benioff Children's Hospital; San Francisco California
5. Section of Hospital Medicine and Infectious Diseases; Department of Pediatrics; University of Colorado/Children's Hospital Colorado; Aurora Colorado
6. Hilo Bay Clinic, Community Health Center; Hilo Hawaii
7. School of Health Studies; University of Memphis; Tennessee
8. Department of Statistics and Biostatistics; Stanford University; Palo Alto California