1. Department of Clinical Neurophysiology, Faculty of Science and Technology, University of Twente, Enschede, the Netherlands (J.H.).
2. Department of Neurology, Rijnstate Hospital, Arnhem, the Netherlands (J.H.).
3. Department of Rehabilitation Medicine, Amsterdam Movement Sciences, Amsterdam Neuroscience, the Netherlands (G.K.).
4. Department of Acquired Brain Injuries, Neurorehabilitation, Amsterdam Rehabilitation Research Centre, Reade, the Netherlands (G.K.).
5. Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL (G.K.).