1. Myeloma Unit, Division of Hematology, University of Torino, Azinda Ospedaliero-Universitaria S. Giovanni Battista, Torino, Italy;
2. Department of Medicine I, Center of Oncology and Hematology, Wilhelminenspital, Vienna, Austria;
3. Department of Clinical Therapeutics, University of Athens School of Medicine, Alexandra General Hospital, Athens, Greece;
4. Department of Hematology, Hospital Clinic, Barcelona, Spain;
5. Servicio de Hematología, Hospital Universitario de Salamanca, and Centro de Investigacion del Cancer, Instituto de Biologia Moleculary Cellular del Cancer (Universdad de Salamanca–Consejo Superior de Investigaciones Cientifica), Salamanca, Spain;
6. Hospital Clinic, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Spain;
7. Istituto di Ematologia Seràgnoli, Università degli Studi di Bologna, Bologna, Italy;
8. Department of Hematology, University Medical Center Utrecht, Utrecht, The Netherlands;
9. Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands;
10. Institute of Cancer Research and Royal Marsden Hospital, London, United Kingdom;
11. Department of Oncology/Hematology, Kantonsspital St Gallen, St Gallen, Switzerland;
12. Department of Haematology, University Hospital of Copenhagen at Rigshospitalet, Copenhagen, Denmark;
13. Division of Stem Cell Transplantation and Immunotherapy, 2nd Department of Medicine, University of Kiel, Kiel, Germany;
14. Department of Internal Medicine and Hemato-oncology, Faculty of Hospital Brno and Babak Research Institute, Faculty of Medicine, Masaryk University, Brno-město, Czech Republic;
15. Aalborg Hospital, Aarhus University Hospital, Aalborg, Denmark;
16. Department of Hematology, Instituto Português de Oncologia, Lisbon, Portugal;
17. Department of Hematology and Oncology, University Medical Center, Hamburg, Germany;
18. Malignant Hematology and Stem Cell Transplantation Service, Alfred Hospital, Victoria, Australia;
19. Department of Hematology, Ankara University, Ankara, Turkey;
20. Department of Internal Medicine II, University Hospital Würzburg, Würzburg, Germany; and
21. Department of Hematology, University Hospital Rotterdam, Rotterdam, The Netherlands