1. Institute of Immunology, Charité Campus Buch, Berlin, Germany;
2. Istituto Oncologico Veneto, Istituiti di Ricovero e Cura a Carattere Scientifico, Padova, Italy;
3. Verona University Hospital and Department of Pathology, Immunology Section, Verona, Italy; and
4. Max Delbrück Center for Molecular Medicine, Berlin, Germany