1. Formerly: Biogen, Cambridge, MA 02142, USA
2. Biogen, 6340, Baar, Switzerland
3. University of Ottawa, Department of Medicine & the Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
4. Biogen, Cambridge, MA 02142, USA
5. Center of Clinical Neuroscience, Carl Gustav Carus University Hospital, 01307, Dresden, Germany
6. Montreal Neurological Institute, McGill University, Montreal, QC H3A 2B4, Canada