1. Immunology Unit, Pompeu Fabra University, Barcelona, Spain;
2. Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy;
3. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA;
4. Institut für Virologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany;
5. Institut d′Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain;
6. Dipartimento di Medicina Sperimentale, Università di Genova, Genova, Italy; and
7. IMIM-Hospital del Mar, Barcelona, Spain