[1] Fdn IRCCS Ist Neurol Carlo Besta, Sc Neurol, Salute Pubbl, Disabilita, Milan, Italy
[2] Fdn IRCCS Ist Neurol Carlo Besta, Dipartimento Neurosci Pediat, Milan, Italy
[3] Univ Freiburg, Dept Neuropediat & Muscle Disorders, Ctr Pediat, Fac Med, Freiburg, Germany
[4] McMaster Univ, Canchild Ctr Childhood Disabil Res, Hamilton, ON, Canada
[5] Fdn IRCCS Ist Neurol Carlo Besta, Dipartimento Neurosci Pediat, Milan, Italy