Nils Erik Gilhus1,2, Günther Deuschl3,4. 1. Department of Clinical Medicine, University of Bergen, Bergen, Norway. 2. Department of Neurology, Haukeland University Hospital, Bergen, Norway. 3. Department of Neurology, University Hospital Schleswig Hostein, Kiel Campus, Christian-Albrechts-University, Kiel, Germany. g.deuschl@neurologie.uni-kiel.de. 4. European Academy of Neurology, Vienna, Austria. g.deuschl@neurologie.uni-kiel.de.