1. Department of Immunology, Royal London Hospital, Barts Health NHS Trust , London , UK
2. National Guideline Centre, Royal College of Physicians , London , UK
3. Immunology Department, Manchester University NHS Trust , Manchester , UK
4. West Midlands Immunodeficiency Centre, Birmingham Heartlands Hospital , Birmingham , UK
5. Department of Immunological Medicine, King’s College Hospital , London , UK
6. Immunodeficiency Centre for Wales, University Hospital of Wales , Cardiff , UK
7. Immunology Department, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust , Cambridge , UK
8. UCL Institute of Immunity and Transplantation, Royal Free Hospital , London , UK
9. Peninsula Immunology and Allergy Service, University Hospitals Plymouth , Plymouth , UK