1. Division of Immunology, Transplantation and Infectious Diseases, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) San Raffaele Scientific Institute, Milan, Italy
2. Vita-Salute San Raffaele University, Milan, Italy
3. Gilead Sciences, Foster City, CA
4. Deparment of Immunology and Microbial Sciences, The Scripps Research Institute, La Jolla, CA
5. Experimental Imaging Center, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) San Raffaele Scientific Institute, Milan, Italy