1. Department of Neuroimmunology, Max-Planck-Institute of Neurobiology, D-82152 Martinsried, Germany
2. Department of Neurology, Ludwig-Maximilians-University, D-81377 Munich, Germany
3. Institute for Clinical Neuroimmunology, Ludwig-Maximilians-University, D-81377 Munich, Germany
4. Institute of Pathology, University of Würzburg, D-97080 Würzburg, Germany
5. Biogen Idec Inc., Cambridge, MA 02142
6. Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, I-00161 Rome, Italy