1. Center of Expertise for Parkinson & Movement Disorders, Department of Neurology, Radboud University Medical Center, Nijmegen, the Netherlands
2. Scientific Centre for Quality of Healthcare, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
3. The Michael J. Fox Foundation for Parkinson’s Research, Patient Council, New York, NY, USA
4. Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands