1. Department of NeurologyMedical University InnsbruckInnsbruck Austria
2. Sobell Department of Motor Neuroscience and Movement DisordersUCL Institute of NeurologyLondon United Kingdom
3. Department of Neurology, Neuroscience Campus AmsterdamVU University Medical CentreAmsterdam The Netherlands
4. Divisions of Human NutritionWageningen UniversityWageningen The Netherlands
5. Study Center Confraternitaet‐PKJ ViennaVienna Austria
6. Department of NeurologyLeiden University Medical CentreLeiden The Netherlands
7. Department of Applied Systems Research and StatisticsJohannes Kepler University LinzLinz Austria
8. Department of Medical Statistics, Informatics and Health EconomicsMedical University InnsbruckInnsbruck Austria
9. Department of NeurologyHospital of BruneckBruneck Italy