1. Department of Psychology “Renzo Canestrari”, University of Bologna, Bologna, Italy
2. Research Unit for General Practice and Section for General Medical Practice, Department of Public Health, Aarhus University, Aarhus, Denmark
3. Rehabilitation Unit, Moriggia Pelascini Hospital, Como, Italy
4. Parkinson Institute, Pini-CTO, Milan, Italy
5. Fondazione Grigioni per Il Morbo di Parkinson, Milan, Italy
6. Department of Health Sciences, University of Florence, Florence, Italy
7. Department of Psychiatry & Neuropsychology, Maastricht University, Maastricht, The Netherlands