1. Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA
2. Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
3. Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA
4. Unidad Nacional de Oncologia Pediátrica, Guatemala City, Guatemala
5. School of Medicine, Francisco Marroquin University, Guatemala City, Guatemala
6. Pediatric Hematology/Oncology/SCT, Center for Global Health, School of Medicine, University of Colorado Anschutz, Aurora, CO, USA