1. Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands;
2. Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands;
3. Division of Pathology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH;
4. Human Oncology and Pathogenesis Program, Department of Medicine, and
5. Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY;
6. Department of Pathology, Ambroise Paré Hospital, Assistance Publique–Hôpitaux de Paris, Boulogne, France;
7. EA4340-Biomarqueurs et Essais Cliniques en Cancérologie et Onco-Hématologie, Versailles Saint-Quentin-en-Yvelines University, Boulogne, France;
8. Department of Pediatric Oncology, Emma Children’s Hospital, and
9. Department of Pathology, Amsterdam University Medical Centers, Amsterdam, The Netherlands;
10. Department of Internal Medicine and Immunology, and
11. Section of Clinical Immunology, Department of Immunology, and
12. Department of Pathology, Erasmus Medical Center University Medical Center Rotterdam, Rotterdam, The Netherlands;
13. Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands;
14. Department of General Medical Oncology, University Hospitals Leuven, Leuven Cancer Institute, Leuven, Belgium;
15. Department of Pathology, University Hospitals Leuven, Katholieke Universiteit Leuven, Leuven, Belgium;
16. Department of Pediatric Hematology and Oncology, and
17. Department of Pathology, Hannover Medical School, Hannover, Germany;
18. Department I – General Pediatrics, Children’s Hospital, Hematology and Oncology,
19. Department of Hematology and Oncology, and
20. Department of Pathology and Neuropathology and Comprehensive Cancer Center, University Hospital Tuebingen, Tuebingen, Germany;
21. Department of Oncology, Hematology and Stem Cell Transplantation, University Children’s Hospital Würzburg, Würzburg, Germany;
22. Department of Pathology, University of Würzburg and Comprehensive Cancer Center Mainfranken, Würzburg, Germany;
23. Division of Pediatric Hematology and Oncology, Department of Pediatrics, Klinikum Chemnitz, Chemnitz, Germany;
24. Department of Oncology, Children’s Memorial Health Institute, Warsaw, Poland;
25. Dmitriy Rogachev National Center for Pediatric Hematology, Oncology and Immunology, Moscow, Russia;
26. Department of Hematology and Oncology, Municipal Educational Hospital N°31, Saint Petersburg, Russia;
27. Department of Bone Marrow Transplantation and
28. Department of Pathology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia;
29. Department of Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children’s Hospital Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy;
30. Pathology Unit, Laboratories Department, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy;
31. Department of Pathology and
32. Department of Pediatric Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy;
33. Department of Pediatric Hematology and Oncology, Trousseau Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France;
34. Department of Pediatric Onco-Hematology and
35. Department of Pathology, Rennes University Hospital, Rennes, France;
36. Department of Hematology, La Conception, University Hospital of Marseille, Marseille, France;
37. Department of Pathology, Necker-Enfants Malades Hospital, Assistance Publique–Hôpitaux de Paris, Paris, France;
38. Department of Pathology, University Hospital of Bordeaux, Bordeaux, France;
39. Department of Internal Medicine, University Hospital La Pitié-Salpêtrière Paris, French National Reference Center for Histiocytoses, Assistance Publique–Hôpitaux de Paris, Paris, France;
40. Newcastle upon Tyne Hospitals, Newcastle upon Tyne, United Kingdom;
41. Department of Pediatric Hematology and Oncology, Nottingham University Hospitals, Nottingham, United Kingdom;
42. Department of Histopathology and
43. Department of Pediatric Oncology, Leeds Children’s Hospital, Leeds, United Kingdom;
44. Department of Hematology, Queensland Children’s Hospital, Brisbane, QLD, Australia;
45. Department of Pathology and Laboratory Medicine, University of Saskatchewan, Saskatoon, SK, Canada;
46. Department of Pathology, Children’s Hospital of Eastern Ontario, Ottawa, ON, Canada;
47. Department of Hematology/Oncology, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada;
48. Division of Anatomic Pathology, Mayo Clinic Rochester, Rochester, MN;
49. Department of Pathology, Medical College of Wisconsin, Milwaukee, WI;
50. Department of Pediatric Oncology, Hospital Sisters Health System St Vincent Children’s Hospital, Green Bay, WI;
51. Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL;
52. Department of Hematology, Oncology and Stem Cell Transplantation, Ann & Robert H. Lurie Children’s Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, IL;
53. Department of Pediatric Hematology and Oncology, St Louis Children’s Hospital, Washington University in St Louis, St Louis, MO;
54. Department of Pediatric Hematology and Oncology, Carilion Children’s Pediatric Hematology and Oncology, Roanoke, VA;
55. Department of Pathology, Massachusetts General Hospital, and
56. Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA;
57. Department of Pathology, Boston Children’s Hospital, Boston, MA;
58. Department of Pediatric Oncology, Dana Farber/Boston Children’s Cancer and Blood Disorders Center, Boston, MA;
59. Department of Hematology and Medical Oncology, Maimonides Medical Center, Brooklyn, NY;
60. Department of Internal Medicine, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY;
61. Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH;
62. Division of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH;
63. Center for Cancer and Blood Disorders, Phoenix Children’s Hospital, Phoenix, AZ;
64. Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands; and
65. Department of Neurology, Memorial Sloan-Kettering Cancer Center, New York, NY