1. Newborn Screening Ontario, Department of Pediatrics, Children’s Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada;
2. Division of Genetics and Genomics, Department of Medicine, Boston Children's Hospital, Boston, MA;
3. Ottawa Institute of Systems Biology and BMI, University of Ottawa, Ottawa, ON, Canada;
4. Department of Pathology, Boston Children's Hospital, Boston, MA;
5. Department of Haematology, Royal Manchester Children’s Hospital, Manchester, United Kingdom;
6. Department of Haematology, Cardiff University School of Medicine, Cardiff, United Kingdom;
7. Immunodeficiency Centre for Wales, University Hospital of Wales, Cardiff, United Kingdom;
8. Department of Paediatrics, Children’s Hospital for Wales, Cardiff, United Kingdom;
9. Department of Child Health, Institute of Molecular and Experimental Medicine, School of Medicine, Cardiff University, Children’s Hospital for Wales, Cardiff, United Kingdom;
10. Dana-Farber/Boston Children’s Cancer and Blood Disorders Center, Boston, MA;
11. Division of Hematology-Oncology, Children’s Cancer and Blood Foundation Laboratories, Weill Cornell Medical College, New York, NY;
12. Department of Pediatrics, Children’s Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada;
13. INSERM UMR773, Université Paris Diderot, Assistance Publique des Hospitaux de Paris, Département de Génétique, Hôpital Xavier Bichat, Paris, France;
14. Department of Pediatric Hematology, Hôpital de la Timone, Marseille, France;
15. Department of Pediatrics, Northwestern University Feinberg School of Medicine, Ann & Robert H. Lurie Children’s Hospital, Chicago, IL;
16. Paediatric Department, Infectious Diseases and Immunodeficiencies Unit, Centro Hospitalar do Porto, Porto, Portugal;
17. Department of Immunology, Royal Manchester Children’s Hospital, Manchester, United Kingdom;
18. Department of Medicine, Hematology-Oncology Section, University of Oklahoma College of Medicine, Oklahoma City, OK;
19. Department of Paediatrics and Medicine, The Hospital for Sick Children, University of Toronto, ON, Canada;
20. Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD;
21. Bristol Children's Hospital, Bristol, United Kingdom;
22. Department of Pediatric Hemato-Oncology and Stem Cells Transplant, Universitair Ziekenhuis Ghent, Belgium;
23. Department of Chemistry and Biochemistry and Center for Structural and Functional Genomics, Concordia University, Montreal, QC, Canada; and
24. Molecular Biomedicine Program, Children's Hospital of Eastern Ontario Research Institute, Department of Pediatrics, University of Ottawa, Ottawa, ON, Canada