1. Faculty of Medicine, University of Iceland, Reykjavik, Iceland
2. Department of Hematology and Coagulation Disorders, Skane University Hospital, Malmö, Sweden
3. Division on Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD
4. Department of Medicine, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
5. Myeloma Service, Memorial Sloan-Kettering Cancer Center, New York, NY