1. Department of Pathology Oregon Health and Science University Portland OR USA
2. Department of Pathology Boston Children’s Hospital Boston MA USA
3. Department of Laboratories Seattle Children’s Hospital Seattle WA USA
4. Department of Pathology Hospital Nacional de Pediatria Juan P. Garrahan Buenos Aires Argentina
5. Department of Oncology Dana‐Farber/Boston Children’s Cancer and Blood Disorders Center Boston MA USA
6. Division of Pediatric Hematology and Oncology Oregon Health and Science University/Doernbecher Children’s Hospital Portland OR USA
7. Cancer and Blood Disorders Center Seattle Children’s HospitalUniversity of Washington Medical Center and Fred Hutchinson Cancer Research Center Seattle WA USA
8. Department of Pathology University of Washington School of Medicine Seattle WA USA
9. Department of Pathology and Laboratory Medicine Children’s Hospital of Philadelphia Philadelphia PA USA