1. Department of Neurology, Rijnstate Hospital, Arnhem, The Netherlands
2. Department of Neurology, UZ Brussel, Brussel, Belgium
3. Center for Neurosciences (C4N), Vrije Universiteit Brussel (VUB), Brussels, Belgium
4. Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands