1. Institute of Medical Microbiology, University of Duisburg-Essen, 45147 Essen, Germany.
2. Institute of Medical Microbiology, Immunology and Hygiene, Technical University of Munich, 81675 Munich, Germany.
3. Institute for Immunology, Philipps University of Marburg, 35043 Marburg, Germany.
4. Department of Research Immunology, Bavarian Nordic GmbH, 82152 Martinsried, Germany.
5. Institute of Virology, University of Zurich, 8006 Zurich, Switzerland.
6. Department of Neurology, Clinic of the University of Munich, 81377 Munich, Germany.
7. World Premier International Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan.