1 Università Telematica San Raffaele, Roma, Italy; Laboratoro Neurofisiologia Sperimentale, IRCCS San Raffaele Pisana, Roma, Italy. Electronic address: barbara.picconi@uniroma5.it.
2 Parkinson's Disease and Movement Disorders Center, Neurocenter of Southern Switzerland - Institute of Clinical Neuroscience of Southern Switzerland, Lugano, Switzerland; Faculty of Biomedical Sciences, Università della Svizzera Italiana (USI), Lugano, Switzerland. Electronic address: salvatore.galati@eoc.ch.