1. Department of Global Pediatric Medicine; St. Jude Children's Research Hospital; Memphis Tennessee USA
2. Division of Critical Care Medicine; St. Jude Children's Research Hospital; Memphis Tennessee USA
3. Department of Pediatrics; Johns Hopkins Children's Center; Baltimore Maryland USA
4. Pediatric Critical Care; Sociedad de Lucha Contra el Cáncer; Cuenca City Ecuador
5. Hematology/Oncology; Unidad Nacional de Oncología Pediátrica; Guatemala City Guatemala
6. Pediatric Critical Care; Unidad Nacional de Oncología Pediátrica; Guatemala City Guatemala
7. Francisco Marroquin University School of Medicine; Guatemala City Guatemala