1. Centre of Chronic Immunodeficiency, University Medical Center Freiburg and University of Freiburg, Germany;
2. Department of Medicine, Imperial College London, United Kingdom;
3. Immunology Department, Great Ormond Street Hospital for Children, London, United Kingdom;
4. Department of Pediatrics, Dr von Hauner Children’s Hospital, Ludwig Maximilian University, Munich, Germany;
5. The University of Texas Health Science Center San Antonio, San Antonio, TX;
6. Section on Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD;
7. Cambridge Institute for Medical Research, Addenbrooke’s Hospital, Cambridge, United Kingdom;
8. University Medical Center Hamburg Eppendorf, Department of Pediatric Hematology and Oncology, Hamburg, Germany;
9. Department of Immunology, Institute of Medical Microbiology and Hygiene, University of Freiburg, Germany;
10. Bristol Heart Institute, University of Bristol, Bristol, United Kingdom;
11. Department of Paediatrics, Mater Dei Hospital, Tal-Qroqq, Msida, Malta;
12. Pediatric Infectious Diseases Research Center, Tehran University of Medical Sciences, Tehran, Iran;
13. Research Center for Immunodeficiencies, Children's Medical Center, and Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran;
14. INSERM U768, Université Paris Descartes, Hôpital Necker-Enfants Malades, Paris, France;
15. Institute of Pathology, University Medical Center Freiburg, Freiburg, Germany;
16. Institute for Transfusion Medicine, University of Ulm, Ulm, Germany;
17. Division of Hematology and Medical Oncology, Akdeniz University Faculty of Medicine, Antalya, Turkey;
18. Center for Pediatrics and Adolescent Medicine, University Medical Center Freiburg, Germany; and
19. Center for Diagnostic, University Medical Center Hamburg Eppendorf, Hamburg, Germany