1. Department of Neurology, Leiden University Medical Centre, Leiden, The Netherlands and Department of Neurology, Sint Franciscus Gasthuis, Rotterdam, The Netherlands
2. Department of Clinical Neurosciences, Institute of Neurology [Royal Free Campus], University College, London, UK
3. Sobell Department of Neurophysiology, Institute of Neurology, Queen Square, London, UK
4. Department of Epidemiology, Biostatistics and HTA, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
5. Department of Neurology, Radboud University Nijmegen Medical Centre, Donders Centre for Brain, Cognition and Behaviour, Nijmegen, The Netherlands