[1] Univ Pisa, Neurol Inst, Pisa, Italy
[2] IRCCS Bambino Gesu, Rome, Italy
[3] Univ Genoa, IRCCS G Gaslini, Dept Pediat, Neuromuscular Serv, Genoa, Italy
[4] IRCCS C Mondino, Mondino Tor Vergata S Lucia Ctr, Pavia, Italy
[5] Univ Siena, Neurol Inst, I-53100 Siena, Italy
[6] Univ Roma La Sapienza, Dept Neurol ORL & Rehabil, Rome, Italy