1. Max-Planck Institute for Experimental Medicine, Hermann-Rein-Str., D-37075 Göttingen, Germany
2. Department of Neurology, University of Göttingen, D-37075 Göttingen, Germany
3. Institute of Neuropathology, University of Göttingen, D-37075 Göttingen, Germany
4. Department of Neuroimmunology, Max-Planck Institute of Neurobiology, D-82152 Martinsried, Germany