1. Department of Neurology, Center of Expertise for Parkinson & Movement Disorders Radboud University Medical Centre; Donders Institute for Brain, Cognition and Behaviour Nijmegen The Netherlands
2. Department of Rehabilitation, Center of Expertise for Parkinson & Movement Disorders Radboud University Medical Centre; Donders Institute for Brain, Cognition and Behaviour Nijmegen The Netherlands
3. Klimmendaal, Rehabilitation Center Arnhem The Netherlands
4. Department of RehabilitationSint Maartenskliniek Nijmegen The Netherlands