1. Institute for Virology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
2. Max von Pettenkofer Institute, Ludwig Maximilians University Munich, Munich, Germany
3. Institute for Biochemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
4. Department of Pediatric Oncology, Hematology and Clinical Immunology, Children's Hospital, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
5. Present address: Department of Otorhinolaryngology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
6. Translational Immunology Research Group (D015), German Cancer Research Center (DKFZ), Heidelberg, Germany