1. Section for Neurology; Institute for Clinical Medicine; University of Bergen; Bergen; Norway
2. Institute of Neuroscience; Norwegian University of Science and Technology; Trondheim; Norway
3. Department of Neurology; Haukeland University Hospital; Bergen; Norway
4. W3-Professur für Neurologische Rehabilitation; Department of Neurology; Universitätsklinikum Erlangen; Erlangen; Germany
5. Department of Ophthalmology; UKT; Tübingen; Germany