1 Fondazione IRCCS Istituto Neurologico Carlo Besta, Department of Clinical Neurosciences, Parkinson and Movement Disorders Unit, Milan, Italy; Parkinson's Centre of Excellence at King's College Hospital and King's College London, London, United Kingdom.
2 Fondazione IRCCS Istituto Neurologico Carlo Besta, Department of Clinical Neurosciences, Parkinson and Movement Disorders Unit, Milan, Italy. Electronic address: roberto.cilia@istituto-besta.it.