1. Immunodeficiency Centre for Wales, University Hospital of Wales, Cardiff, UK
2. Department of Immunology and IdISSC, Hospital Clínico San Carlos, Madrid, Spain
3. Department of Molecular Medicine, Sapienza University of Rome, Italy
4. Pediatric Infectious Diseases and Immunodeficiencies Unit, Jeffrey Modell Diagnostic and Research Centre, Hospital Universitari Vall d'Hebron, Barcelona, Spain
5. Department of Medicine (DIMED), Clinical Immunology Unit, University of Padua, Italy
6. University Department of Pediatrics, CHR Liege, Belgium
7. Respiratory Diseases Department, Hôpital FOCH, University Versailles-St Quentin, Suresnes, France
8. The Children's Hospital, Skåne University Hospital, Lund, Sweden
9. Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
10. Department of Immunology, Barts and The London National Health Service Trust, London, UK
11. Center for Chronic Immunodeficiency, Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Germany
12. Center for Primary Immunodeficiency, Department of Paediatric Immunology and Pulmonology, Jeffrey Modell Diagnostic and Research Centre, Ghent University Hospital, Belgium
13. Department of Biomedicine, Immunoallergology Unit, AOU Craeggi, University of Florence, Italy
14. Jeroen Bosch Academy, Jeroen Bosch Hospital, ’s-Hertogenbosch, the Netherlands
15. Tranzo, Tilburg University, Tilburg, the Netherlands