1. Department of Neurology; Jeroen Bosch Hospital; 's-Hertogenbosch The Netherlands
2. Department of Neurology and Clinical Neurophysiology; Donders Centre for Neuroscience, Radboud University Medical Center; Nijmegen The Netherlands
3. Department of Rehabilitation; Donders Centre for Neuroscience, Radboud University Medical Center; P.O. Box 9101 6500 HB Nijmegen The Netherlands