1. Department of Neurology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
2. Department of Clinical Medicine, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
3. Department of Clinical Medicine, University of Bergen and Haukeland University Hospital, Bergen, Norway
4. Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
5. Department of Neurology, Hanamaki General Hospital, Hanamaki, Iwate, Japan
6. UCB Pharma, Cambridge, MA, USA
7. Department of Neurology, International University of Health and Welfare, Narita, Chiba, Japan
8. Department of Neurology, Institute of Translational Neurology, University of Münster, Münster, Germany