1 Parkinson and Movement Disorders Unit, Department of Clinical Neurosciences, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy.
2 Department of Health Sciences, Università degli Studi di Milano, Milan, Italy.
3 Department of Neuroscience and Rehabilitation, University of Ferrara, Ferrara, Italy.
4 Parkinson's Centre of Excellence at King's College Hospital and King's College London, London, UK.
5 Medical Genetics and Neurogenetics Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy.
6 Department of Neuroscience, Università Degli Studi di Milano-Bicocca, Milan, Italy.
7 Medical Genetics Unit, ASST Santi Paolo e Carlo, Milan, Italy.
8 Division of Medical Genetics, Meyer Children's Hospital IRCCS, Florence, Italy and Department of Clinical and Experimental Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy.
9 Laboratorio di Genetica Medica, ASST Papa Giovanni XXIII, Bergamo, Italy.