1. Faculty of Medicine, University of Iceland, Reykjavik, Iceland;
2. Department of Internal Medicine, University of Iowa Hospitals and Clinics, Iowa City, IA;
3. Division of Hematology, Department of Medicine, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden;
4. Department of Hematology, Skåne University Hospital, Malmö, Sweden;
5. Myeloma Service, Memorial Sloan Kettering Cancer Center, New York, NY;
6. Division of Oncology and Pathology, Department of Clinical Sciences, Faculty of Medicine, Lund University, Lund, Sweden; and
7. Division of Hematology, Oncology, Blood and Marrow Transplantation, Department of Internal Medicine, University of Iowa Hospitals and Clinics, Iowa City, IA