1. Department of Haematology, University College London Hospitals NHS Foundation Trust, London, United Kingdom
2. Royal Bournemouth Hospital, Bournemouth, United Kingdom
3. University Hospitals Dorset, Bournemouth, United Kingdom
4. University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
5. Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
6. East Kent Hospitals University NHS Foundation Trust, Canterbury, United Kingdom
7. St. James's University Hospital, Leeds, United Kingdom
8. Royal United Hospital, Bath, United Kingdom
9. The Royal Marsden NHS Foundation Trust, Sutton, United Kingdom
10. Aneurin Bevan University Health Board, Abergavenny, United Kingdom
11. King's College Hospital NHS Foundation Trust, London, United Kingdom
12. Department of Haematology, Hammersmith Hospital, Imperial College Healthcare NHS Foundation Trust, London, United Kingdom
13. The Christie NHS Foundation Trust and Manchester Cancer Research Centre, Manchester, United Kingdom
14. Northwick Park Hospital, London, United Kingdom
15. University College London Hospital, UCLH Centre for Waldenström and Related Conditions, London, United Kingdom
16. London North West University Healthcare NHS Trust and University College London Hospital, London, United Kingdom
17. Torbay and South Devon NHS trust, Torbay, United Kingdom
18. The Clatterbridge Cancer Centre NHS Foundation Trust/ Liverpool University Hosptials NHS Trust, Liverpool, United Kingdom
19. Cardiff and Vale University Hospital, Cardiff, United Kingdom
20. University Hospitals Plymouth NHS Trust, Plymouth, United Kingdom
21. University College London Hospitals NHS Foundation Trust, London, United Kingdom
22. University College London Hospitals NHS Foundation Trust, UCLH Centre for Waldenström's Macroglobulinemia and Related Conditions, London, United Kingdom