1 Donders Institute for Brain, Cognition and Behaviour, Department of Neurology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. rreinink@spaarnegasthuis.nl.
2 Department of Neurology, Spaarne Gasthuis Hospital, Haarlem, The Netherlands. rreinink@spaarnegasthuis.nl.
3 Donders Institute for Brain, Cognition and Behaviour, Department of Neurology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.