1. Department of Molecular Medicine, Institute of Basic Medical Sciences University of Oslo Oslo Norway
2. Department of Clinical and Molecular Medicine Norwegian University of Science and Technology (NTNU) Trondheim Norway
3. Department of Neurology Neuroclinic, St. Olavs Hospital Trondheim Norway
4. Department of Neurology Oslo University Hospital Oslo Norway
5. Research Group of Molecular Neurobiology Max Planck Institute for Medical Research Heidelberg Germany