[1] Division of Neurology,
[2] E.O. Ospedali Galliera,undefined
[3] Mura delle Cappuccine 14,undefined
[4] I-16128 Genoa,undefined
[5] Italy e-mail: simonetti@galliera.it Tel.: +39-10-56321,undefined
[6] Fax: +39-10-5632699,undefined
[7] Department of Clinical Neurophysiology,undefined
[8] Neuroscience Center,undefined
[9] Rigshospitalet,undefined
[10] Copenhagen,undefined
[11] Denmark,undefined