[1] Univ Genoa, Ist Gaslini, Serv Malattie Neuromuscolari, I-16147 Genoa, Italy
[2] Univ Rome La Sapienza, Dipartimento Med Sperimentale & Patol, Rome, Italy
[3] Albert Einstein Coll Med, Dept Mol Pharmacol, Bronx, NY 10461 USA
[4] Univ Aquila, Dipartimento Med Sperimentale, I-67100 Laquila, Italy
[5] Columbia Univ, Dept Neurol, New York, NY USA