1. Lymphoma Unit, Department of Onco‐Hematology IRCCS San Raffaele Scientific Institute Milan Italy
2. Service de Neurologie 2‐Mazarin Hôpitaux Universitaires La Pitié Salpêtrière, APHP, Sorbonne Université Paris France
3. Hematology Department University Hospitals NHS Trust Nottingham UK
4. Hôpital René Huguenin‐Institut Curie, Saint‐Cloud Paris France
5. Department of Neurology Memorial Sloan Kettering Cancer Center New York New York USA
6. Division of Hematology Ospedale San Bortolo Vicenza Italy
7. Barking Havering and Redbridge University Hospitals NHS Trust London UK
8. Derriford Hospital Plymouth UK
9. Department of Medicine, Section of Hematology University of Verona Verona Italy
10. Division of Hematology, Fondazione IRCCS Policlinico San Matteo and Department of Molecular Medicine University of Pavia Pavia Italy
11. Department of Haematology Queen Elizabeth Hospital Birmingham UK
12. Department of Hematology and Oncology University of Miami/Sylvester Comprehensive Cancer Center Miami Florida USA
13. Division of Hematology Campus Bio Medico Rome Italy
14. Division of Hematology Ospedale Careggi Florence Italy
15. Division of Neuro‐Oncology Massachusetts General Hospital Cancer Center Boston Massachusetts USA
16. Institute of Hematology, Davidoff Cancer Center, Rabin Medical Center Petah‐Tikva Israel
17. Division of Hematology, Ospedale Maggiore Novara Italy
18. UOC Ematologia, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy
19. Division of Hematology Azienda USL‐IRCCS of Reggio Emilia Reggio Emilia Italy
20. Department of Biomedicine and Prevention University Tor Vergata Rome Italy
21. NIHR Oxford Biomedical Research Centre Churchill Hospital Oxford UK
22. Department of Emergency and Organ Transplantation ‘Aldo Moro’ University School of Medicine, and Unit of Hematology and Stem Cell Transplantation, AOUC Policlinico Bari Italy
23. Department of Neurology Brigham and Women’s Hospital Boston Massachusetts USA
24. Department of Haematology University College London Hospital London UK