University of Duisburg-Essen - Institute for Virology, University of Duisburg-Essen - Institute for Virology, University of Duisburg-Essen - Institute for Virology, Heinrich Heine University Dusseldorf - Institute of Virology, University of Duisburg-Essen - Institute of Medical Microbiology, University of Duisburg-Essen - Institute for Immunology, University of Colorado at Denver - Department of Medicine, University of Duisburg-Essen - Institute for Virology and University of Duisburg-Essen - Institute for Virology