1. Heinrich-Pette-Institute, Leibniz-Institute for Experimental Virology, Hamburg, Germany
2. Present Address: Woldsenweg 7, 20249, Hamburg, Germany
3. Institute for Medical Microbiology, Immunology and Hygiene, Medical Center and Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
4. Institute for Tumor Biology, University Medical Center Hamburg-Eppendorf (UKE), University of Hamburg, Hamburg, Germany