1. Seràgnoli Institute of Hematology, Bologna University School of Medicine, Bologna, Italy;
2. Myeloma Unit, Division of Hematology, University of Torino, Azienda Ospedaliera Citta' della Salute e della Scienza di Torino, Torino, Italy;
3. Department of Hematology, VU University Medical Center, Amsterdam, Netherlands;
4. School of Medicine, National and Kapodistrian University of Athens, Athens, Greece;
5. Masaryk University Hospital, Brno, Czech Republic;
6. Ankara Universitesi Tip Fakultesi, Ankara, Turkey;
7. Erasmus Medical Center, Department of Hematology, Rotterdam, Netherlands;
8. Department of Hematology, Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark;
9. South Elvsborg Hospital, Borås, Sweden;
10. Department of Hematology, Sapienza University of Rome, Rome, Italy;
11. Kantonsspital St. Gallen, St. Gallen, Switzerland;
12. Division of Hematology, Ospedale Ferrarotto, University of Catania, Catania, Italy;
13. HOVON Data Center, Erasmus MC Cancer Institute-Clinical Trial Center, Rotterdam, Netherlands;
14. ZNA Stuivenberg, Department of Hematology, Antwerp, Belgium;
15. Wilhelminen Cancer Research Institute, Wilhelminenspital, Department of Medicine, Center of Oncology, Hematology and Palliative Care, Vienna, Austria;
16. Erasmus Medical Center, Rotterdam, Netherlands;