1. Immunology of Infection, Department of Infectious Disease Imperial College London London UK
2. Department of Infection and Immunity Sciences North West London Pathology London UK
3. UK NEQAS for Leucocyte Immunophenotyping Sheffield Teaching Hospitals NHS Foundation Trust Sheffield UK
4. Hematology Laboratory and Transfusion Center New Hospital of Legnano: Ospedale Nuovo di Legnano Milan Italy
5. Haematopathology and Oncology Diagnostic Service Cambridge University Hospitals NHS Foundation Trust Cambridge UK
6. Haematological Malignancy Diagnostic Service St James's University Hospital Leeds UK
7. Department of Haemato‐Oncology Royal Marsden Hospital London UK
8. Division of Haemato‐Oncology St Bartholomew's Hospital, Barts Health NHS Trust London UK
9. Pathology Group Blizard Institute, Queen Mary University of London London UK
10. Department of Haematology Sheffield Teaching Hospitals NHS Foundation Trust Sheffield UK
11. Tees Valley Pathology Service James Cook University Hospital Middlesbrough UK
12. Haematology, Doncaster and Bassetlaw Teaching Hospitals NHS Trust Doncaster UK
13. Greater Manchester Immunology Service Manchester University NHS Foundation Trust Manchester UK
14. Department of Immunology and Immunogenetics North Bristol NHS Trust Bristol UK