1. From the Institute of Hematology and Medical Oncology “Seràgnoli,” University of Bologna, Bologna, Italy; Department of Cellular Biotechnology and Hematology, University “La Sapienza,” Rome, Italy; Department of Experimental Medicine and Pathology, University “La Sapienza,” Rome, Italy; and Service of Pathologic Anatomy and Unit of Hematopathology, University of Bologna, Bologna, Italy.