[1] Neurometabolic Unit,
[2] Institute of Neurological Sciences,undefined
[3] University of Siena,undefined
[4] Viale Bracci 2,undefined
[5] I-53100 Siena,undefined
[6] Italy e-mail: dotti@unisi.it,undefined
[7] Tel.: +39-577-585760. Fax: +39-577-40327,undefined
[8] Institute of Internal Medicine,undefined
[9] University of Siena,undefined
[10] Viale Bracci 2,undefined
[11] I-53100 Siena,undefined
[12] Italy,undefined