1. Department of Pediatric Pneumology, Immunology and Intensive Care Charité UniversitätsmedizinBerlin University Hospital Center Berlin Germany
2. Department of Pediatric Hematology, Oncology and Stem Cell Transplantation Charité Universitätsmedizin –Berlin University Hospital Center Berlin Germany
3. Department of Pediatrics Dr. von Hauner Children's Hospital University HospitalLudwig‐Maximilians‐University Munich Munich Germany
4. Pediatric Hematology‐Immunology Unit AP‐HPNecker Hospital Paris France
5. Department of Pediatrics Faculty of Medicine Carl Gustav CarusTU Dresden Dresden Germany
6. Department of Women's and Children's Health Institute of Translational Medicine University of Liverpool and Department of RheumatologyAlder Hey Children's NHS Foundation Trust Liverpool UK
7. Department of Pediatric Pulmonology, Allergy and NeonatologyHannover Medical School Hannover Germany
8. Center of Chronic Immunodeficiency (CCI) Medical Center–University of Freiburg Faculty of Medicine University of Freiburg Freiburg Germany
9. Center of Pediatrics Medical Center–University of Freiburg Faculty of Medicine University of Freiburg Freiburg Germany
10. Department of Immunology Labor Berlin GmbH Berlin Germany
11. Berlin‐Brandenburg Center for Regenerative Therapies Berlin Germany
12. Department of Pediatric Oncology, Hematology and Hemostaseology University of Leipzig Leipzig Germany