1. Max Planck Institute for Neurological Research, University of Cologne, Gleuelerstrasse 50, D-50931 Cologne, Germany
2. Department of Dermatology, University of Cologne, Gleuelerstrasse 50, D-50931 Cologne, Germany
3. Department of Neurology, University of Cologne, Gleuelerstrasse 50, D-50931 Cologne, Germany