C F Bagella1, L M Romito1, V Scaioli2, A E Elia3. 1. Department of Movement Disorders, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy. 2. Department of Neurophysiopathology and Epilepsy Centre, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy. 3. Department of Movement Disorders, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy. antonio.elia@istituto-besta.it.