1. Sobell Department of Motor Neuroscience, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, London, UK
2. Department of Neurology, Innsbruck Medical University, Innsbruck, Austria
3. Department of Neurology, Medical University Ljubljana, Ljubljana, Slovenia
4. Department of Neurology, Kantonsspital St. Gallen, St. Gallen, Switzerland
5. Department of Clinical Neuroscience, Umeå University, Umeå, Sweden
6. Department of Community Medicine and Rehabilitation, Umeå University, Umeå, Sweden
7. Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK