1. Institute for Virology and Immunobiology; University of Würzburg; Würzburg; Germany
2. Department of Neuroimmunology; Institute for Multiple Sclerosis Research and The Hertie Foundation; University Medical Center Göttingen; Göttingen; Germany
3. Max Planck Institute of Experimental Medicine; Neurogenetics; Göttingen; Germany
4. Institute of Medical Microbiology and Hospital Hygiene; Clinical Centre of Heinrich Heine University; Düsseldorf; Germany