1. St Jude Children's Research Hospital, Memphis, TN
2. Unidad Nacional de Oncología Pediátrica, Guatemala City, Guatemala
3. Laboratorio de Patología Dra. Elizabeth Orellana, Guatemala City, Guatemala
4. Clínica de Radioterapia La Asunción, Guatemala City, Guatemala
5. University of Illinois College of Medicine, Peoria, IL
6. Children's Hospital Colorado, School of Medicine, University of Colorado, Aurora, IL
7. Pediatric Hematology/Oncology/SCT, University of Colorado Anschutz Medical Center, Aurora, IL
8. Hemophilia and Thrombosis Center, University of Colorado Anschutz Medical Center, Aurora, IL
9. Tettamanti Center, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
10. Pediatrics, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
11. Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
12. Hospital Saint-Damien, Port-au-Prince, Haiti
13. Hospital Nacional de Niños Benjamin Bloom, San Salvador, El Salvador
14. Universidad Francisco Marroquin, Guatemala City, Guatemala