1. Institute of Medical Microbiology and Hygiene, University Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany
2. Heinrich-Pette-Institute for Experimental Virology and Immunology, Martinistr. 52, 20251 Hamburg, Germany
3. Helmholtz Zentrum München, Institute of Molecular Immunology, Marchioninistr. 25, 81377 Munich, Germany