1. a Institute for Rehabilitation Research (iRv), Zandbergsweg 111, 6432 CC Hoensbroek, The Netherlands
2. b Department of Anatomy and Embryology, University Maastricht, Maastricht, The Netherlands
3. d University Hospital Maastricht, Department of Clinical Neurophysiology, Maastricht, The Netherlands
4. c Department of Movement Sciences, University Maastricht, Maastricht, The Netherlands