1. Cellular Immunology Unit, Division of Immunology, Transplantation, and Infectious Diseases,
2. Unit of B Cell Neoplasia, Division of Experimental Oncology, and
3. Unit of Lymphoid Malignancies, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy;
4. Università Vita-Salute San Raffaele, Milan, Italy; and
5. Experimental Immunology Unit, Division of Immunology, Transplantation, and Infectious Diseases, IRCCS Ospedale San Raffaele, Milan, Italy