Eugenio Mercuri1, Valeria Sansone2. 1. Pediatric Neurology, Catholic University of the Sacred Heart, I-00168, Rome, Italy; Nemo Clinical Centre, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy. Electronic address: eugeniomaria.mercuri@unicatt.it. 2. Neurorehabilitation Unit, University of Milan, The NEMO Clinical Center in Milan, Milan, Italy.