1. DINOGMI, University of Genoa, Genova, Italy
2. Sant Pau Hospital, Universitat Autònoma de Barcelona, CIBERNED, Barcelona, Spain
3. Department of Neurology, AZ St-Jan Brugge-Oostende AV, Campus Brugge, Brugge & Ghent University Hospital, Ghent, Belgium
4. Biocruces Research Institute, Barakaldo, Spain
5. Department of Neurology, Cantonal Hospital St.Gallen, Switzerland
6. Fairfield General Hospital, Bury, Greater Manchester, UK
7. Parkinson Center, University Policlinico Tor Vergata, Roma, Italy
8. Department of Neurology, University of Muenster, Muenster, Germany
9. Parkinson-Klinik Ortenau, University of Freiburg, Wolfach, Germany