Jeannette Hofmeijer1,2, Barry J Ruijter1, Michel J A M van Putten1,3. 1. Department of Clinical Neurophysiology, Technical Medical Center, University of Twente, Enschede. 2. Department of Neurology, Rijnstate Hospital, Arnhem. 3. Departments of Neurology and Clinical Neurophysiology, Medical Spectrum Twente, Enschede, the Netherlands.