1. Landspítali–The National University Hospital of Iceland and Faculty of Medicine, University of Iceland, Reykjavík, Iceland (E.E., S.R., P.T.O., B.A.A., R.P., O.S.I., S.Y.K.)
2. Faculty of Medicine, University of Iceland, Reykjavík, Iceland, and Department of Hematology, Rigshospitalet, Copenhagen, Denmark (S.T.)
3. Faculty of Medicine, University of Iceland, Reykjavík, Iceland, and Skåne University Hospital, Lund, Sweden (T.E.L.)
4. Faculty of Medicine, University of Iceland, Reykjavík, Iceland (E.R.R., G.A.S., A.R.T., G.K.G., A.O., J.S., T.J.L.)
5. Landspítali–The National University Hospital of Iceland, Reykjavík, Iceland (B.V., M.S., I.O., I.T., S.V.S., F.S., H.S.)
6. Akureyri Hospital, Akureyri, Iceland (A.J.)
7. Myeloma Service, Memorial Sloan Kettering Cancer Center, New York, New York (M.H.)
8. Cedars-Sinai Samuel Oschin Cancer Center, Los Angeles, California (B.G.M.D.)
9. The Binding Site, Birmingham, West Midlands, United Kingdom (S.H.)
10. Sylvester Comprehensive Cancer Center, University of Miami, Miami, Florida (O.L.)
11. Center for Public Health Sciences, University of Iceland, Reykjavík, Iceland (T.A.).