1. Faculty of Medicine University of Iceland Reykjavik Iceland
2. Centre for Public Health Sciences University of Iceland Reykjavik Iceland
3. Department of Hematology and Coagulation Disorders Skane University Hospital Malmö Sweden
4. Department of Medicine Karolinska University Hospital and Karolinska Institutet Stockholm Sweden
5. Myeloma Service Memorial Sloan‐Kettering Cancer Center New York NY USA