1. 1 Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts
2. 2 Department of Pathology, University Hospitals Cleveland Medical Center and Case Western Reserve University School of Medicine, Cleveland, Ohio
3. 3 Department of Pathology, University of California San Diego, San Diego
4. 4 Department of Pathology and Immunology, Texas Children's Hospital and Baylor College of Medicine, Houston
5. 5 Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, New York
6. 6 Pathology Unit, Azienda Unità Sanitaria Locale - IRCCS di Reggio Emilia, Reggio Emilia, Italy
7. 7 CellNetix Pathology and Laboratories, Olympia, Washington
8. 8 Division of Pediatric Pathology, University of Utah and Primary Children's Hospital, Salt Lake City
9. 9 Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois
10. 10 Department of Pathology, University of Chicago Pritzker School of Medicine, Chicago, Illinois
11. 11 Department of Pathology, Magee-Womens Hospital of UPMC, Pittsburgh, Pennsylvania
12. 12 Division of Anatomic Pathology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
13. 13 Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia
14. 14 Department of Pathology and Laboratory Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
15. 15 Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts
16. 16 Department of Pathology, Le Bonheur Children's Hospital, Memphis, Tennessee
17. 17 Department of Pathology, University of Tennessee Health Science Center, Memphis
18. 18 Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Boston