1. Department of Medicine, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
2. Department of Hematology, Landspitali National University Hospital, Faculty of Medicine, University of Iceland, Reykjavik, Iceland
3. Multiple Myeloma Section, Metabolism Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
4. Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD