1. Faculty of Medicine, University of Iceland, Reykjavik, Iceland
2. Department of Hematology and Coagulation Disorders, Skane University Hospital, Malmö, Sweden
3. Division of Hematology, Department of Medicine, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
4. Multiple Myeloma Section, Lymphoid Malignancies Branch, National Cancer Institute, Bethesda, Maryland
5. Myeloma Service, Memorial Sloan-Kettering Cancer Center, New York, New York
6. Faculty of Medicine, University of Iceland, Reykjavik, Iceland3Division of Hematology, Department of Medicine, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden