1. Sobell Department of Motor Neuroscience and Movement Disorders; UCL Institute of Neurology; London United Kingdom
2. Department of Neurology; Amedeo Avogadro University; Novara Italy
3. CSS-Mendel Laboratory; IRCCS Casa Sollievo della Sofferenza; San Giovanni Rotondo Italy
4. Biostatistics Unit; IRCCS Casa Sollievo della Sofferenza; San Giovanni Rotondo Italy
5. Department of Neurosciences and Sensory Organs; School of Motor Sciences; “Aldo Moro” University of Bari; Bari Italy
6. Laboratory of Clinical Epidemiology of Diabetes and Chronic Diseases; Consorzio Mario Negri Sud; Santa Maria Imbaro Italy
7. Department of Medicine and Surgery; University of Salerno; Salerno Italy