1. Georgia Cancer Center, Augusta University, Augusta, GA 30912, USA
2. Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy
3. Division of Hematology and Hematologic Malignancies, University of Utah, Salt Lake City, UT 84112, USA
4. Hematology Unit, S Eugenio Hospital, ASL Roma 2, Tor Vergata University, Rome 00144, Italy
5. Pfizer Inc., Collegeville, PA 19426, USA
6. Clinic for Hematology, Oncology, Hemostaseology and Stem Cell Transplantation, Universitätsklinikum RWTH Aachen, Aachen, Germany