1. Regional Immunology Service, The Royal Hospitals, Belfast, East Yorkshire, UK
2. Centre for Infection and Immunity, Queen's University Belfast, Belfast, East Yorkshire, UK
3. Department of Immunology, Barts Health NHS Trust, Royal London Hospital, London, East Yorkshire, UK
4. Royal Free Hospital, University College London, London, East Yorkshire, UK
5. Central Manchester University Hospitals NHS Foundation Trust, Manchester Royal Infirmary, Manchester, East Yorkshire, UK
6. Institute of Medical Biometry and Medical Informatics, University Medical Center, Freiburg, Germany
7. Medical Science Department, CSL Behring Ltd, Sussex, East Yorkshire, UK
8. Great North Children's Hospital, Royal Victoria Infirmary, Newcastle upon Tyne, East Yorkshire, UK
9. Great Ormond Street Hospital and Institute of Child Health, London, East Yorkshire, UK
10. West Midlands Primary Immunodeficiency Centre, Birmingham Heartlands Hospital, Birmingham, East Yorkshire, UK
11. Addenbrookes Hospital, Cambridge, East Yorkshire, UK
12. Papworth NHS Foundation Trust, Cambridge, East Yorkshire, UK
13. Derriford Hospital, Plymouth, East Yorkshire, UK
14. Leeds Teaching Hospitals NHS Trust, Leeds, East Yorkshire, UK
15. John Radcliffe Hospital, Oxford, East Yorkshire, UK
16. University Hospital of Wales, Cardiff, East Yorkshire, UK
17. Salford Royal NHS Foundation Trust, Salford, East Yorkshire, UK
18. Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, East Yorkshire, UK
19. Epsom & St Helier University Hospitals NHS Trust, Carshalton, East Yorkshire, UK
20. Hull & East Yorkshire Hospitals NHS Trust, Castle Hill Hospital, Cottingham, East Yorkshire, UK
21. Regional Department of Immunology, Royal Victoria Infirmary, Newcastle upon Tyne, East Yorkshire, UK
22. Royal Liverpool and Broadgreen University Hospitals, UK
23. Alder Hey Children's Hospital, Liverpool, UK
24. Ninewells Hospital and University of Dundee, Dundee, UK
25. Queen's Medical Centre, Nottingham, UK
26. Paediatric Infectious Diseases Unit, St George's Hospital, London, East Yorkshire, UK
27. Aberdeen Royal Infirmary, Aberdeen, UK
28. Department of Immunology, City Hospital, SWBH NHS Trust, Birmingham, East Yorkshire, UK
29. Scottish National Blood Transfusion Service, Edinburgh, UK
30. Frimley Park Hospital, Surrey, UK