University of Lille, Centre Hospitalier Universitaire de Lille, Service des Maladies du Sang, Lille, France. Electronic address: thierry.facon@chru-lille.fr. Department of Hematology, Mayo Clinic Rochester, Rochester, MN, USA. Vejle Hospital and University of Southern Denmark, Vejle, Denmark. Department of Lymphoma and Myeloma, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. Department of Hematology, University Hospital Hôtel-Dieu, Nantes, France. Arnie Charbonneau Cancer Research Institute, University of Calgary, Calgary, AB, Canada. The Royal Wolverhampton NHS Trust and University of Wolverhampton, Wolverhampton, UK. Karolinska Institute, Department of Medicine, Division of Hematology, Karolinska University Hospital at Huddinge, Stockholm, Sweden. Department of Hematology, Hôpital Haut Lévêque, University Hospital, Pessac, France. University of Melbourne, St Vincent's Hospital, Melbourne, VIC, Australia. University Hospital Heidelberg, Internal Medicine V and National Center for Tumor Diseases, Heidelberg, Germany. Department of Medicine/Haematology, National University of Ireland, Galway, Ireland. Centre Hospitalier Universitaire de Toulouse, Institut Universitaire du Cancer de Toulouse - Oncopole, Université de Toulouse, Université Paul Sabatier, Service d'Hématologie, Toulouse, France. Cross Cancer Institute, University of Alberta, Edmonton, AB, Canada. Department of Oncology, Hematology and Bone Marrow Transplantation with Section of Pneumology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. Florida Cancer Specialists, St Petersburg, FL, USA. Center for Multiple Myeloma, Massachusetts General Hospital Cancer Center, Boston, MA, USA. Centre Hospitalier Départemental Vendée, La Roche sur Yon, France. Centre Hospitalier Universitaire de Caen, Caen, France. Department of Clinical Haematology, Hopital Necker-Enfants Malades, Paris, France. Centre Hospitalier Universitaire de Poitiers, Hôpital la Milétrie, Poitiers, France. Genmab US, Plainsboro, NJ, USA. Janssen Research & Development, Raritan, NJ, USA. Janssen Research & Development, Beerse, Belgium. Janssen Research & Development, Spring House, PA, USA. Janssen Research & Development, Leiden, Netherlands. Levine Cancer Institute/Atrium Health, Charlotte, NC, USA.