[1] Servizio di Neuroradiologia,
[2] Ospedale San Raffaele,undefined
[3] Via Olgettina 60,undefined
[4] I-20 132 Milano,undefined
[5] Italy e-mail: simionato.franco@hsr.it Tel. + 39(2)26 43 27 26 Fax + 39(2)26 43 30 11,undefined
[6] Department of Anaesthesiology and Intensive Care,undefined
[7] San Raffaele Hospital,undefined
[8] University of Milan,undefined
[9] Italy,undefined