1. Center of Chronic Immunodeficiency, University Medical Center Freiburg and University of Freiburg, Freiburg, Germany;
2. Ramaciotti Immunization Genomics Laboratory, John Curtin School of Medical Research, Australian National University, Acton, Australia;
3. Department of Haematology and Oncology, Children's Hospital, University of Hamburg, Hamburg, Germany;
4. Gemeinschaftskrankenhaus Herdecke, Department of Paediatric and Adolescent Medicine, Herdecke and University of Witten/Herdecke, Witten, Germany;
5. Pediatric Hematology, Oncology and Immunology, Klinikum Stuttgart/Olgahospital, Stuttgart, Germany;
6. Department of Pediatrics, Division of Pediatric Hematology, Gaziantep University, Gaziantep, Turkey;
7. Pediatric Hematology Unit of the Department of Pediatrics, Medical School of Gazi University, Ankara, Turkey;
8. Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden;
9. Department of Pediatrics, Zagazig University, Zagazig, Egypt;
10. Immunology Department, Great Ormond Street Hospital for Children, London, United Kingdom;
11. Department of Paediatrics, University Hospital Kiel, Kiel, Germany;
12. Center for Pediatrics and Adolescent Medicine, University Medical Center Freiburg, Freiburg, Germany;
13. Institute of Pathology, Department of General Pathology, University of Freiburg, Freiburg, Germany;
14. Institute for Medical Microbiology and Hygiene, Department of Immunology, University of Freiburg, Freiburg, Germany;
15. Centre for Diagnostics, University Medical Center, Hamburg-Eppendorf and Research Institute, Children's Cancer Center, Hamburg, Germany; and
16. Institute for Transfusion Medicine, University Hospital Ulm and Institute for Clinical Transfusion Medicine and Immunogenetics, Ulm, Germany