1. Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands;
2. Jerome Lipper Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA;
3. Laboratory of Immunogenetics, Department of Medical Sciences and
4. Center for Experimental Research and Medical Studies (CeRMS), University of Turin, Turin, Italy; and
5. Department of Transplantation Immunology, University Hospital, Turin, Italy