1. Department of Medicine, Solna Karolinska Institutet Stockholm Sweden
2. Myeloma Service Department of Medicine Memorial Sloan‐Kettering Cancer Center New York NY USA
3. Department of Medicine Stockholm South Hospital and Karolinska Institutet Stockholm Sweden
4. Hematology Section NU Hospital Group Uddevalla Sweden
5. Department of Hematology University Hospital Linkoping Linkoping Sweden
6. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
7. Faculty of Medicine University of Iceland Reykjavik Iceland
8. Department of Hematology Landspitali National University Hospital Reykjavik Iceland