1. Department of Neurosciences, Reproductive Sciences and Odontostomatology, Federico II University, Naples, Italy
2. Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, London, UK
3. Department of Neurological and Movement Sciences, University of Verona, Policlinico Borgo Roma, Verona, Italy
4. Center for Neurodegenerative Diseases (CEMAND), Neuroscience Section, Department of Medicine, University of Salerno, Salerno, Italy
5. Morton and Gloria Shulman Movement Disorders Clinic and the Edmond J. Safra Program in Parkinson's Disease, Division of Neurology, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada
6. Department of Psychology, Neuropsychology Laboratory, Second University of Naples, Caserta, Italy
7. IDC Hermitage-Capodimonte, Naples, Italy
8. Department of Primary Care and Public Health, Imperial College, London, UK
9. Department of Public Health, Federico II University, Naples, Italy
10. Department of Advanced Biomedical Sciences, University Federico II, Naples, Italy
11. Institute of Biostructure and Bioimaging, National Research Council, Naples, Italy
12. Department of Motor Sciences, University Parthenope, Naples, Italy