1. Department of Haematology, UCL Cancer Institute, University College London, London, United Kingdom;
2. Department of Haematology, University College London Hospitals NHS Foundation Trust, London, United Kingdom;
3. Department of Haematology, Kings College Hospital, London, United Kingdom;
4. Department of Haematology, Manchester Royal Infirmary, Manchester, United Kingdom;
5. Department of Haematology, The Christie NHS Foundation Trust, Manchester, United Kingdom;
6. Department of Haematology, Queen Elizabeth University Hospital, Glasgow, United Kingdom;
7. Department of Haematology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom;
8. Department of Haematology, University Hospital Southampton, Southampton, United Kingdom;
9. Department of Haematology, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, United Kingdom;
10. Department of Haematology, The Royal Marsden NHS Foundation Trust, London, United Kingdom;
11. Department of Haematology, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom;
12. Department of Haematology, Nottingham University Hospitals NHS Trust, Nottingham, United Kingdom; and
13. Department of Haematology, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom