[1] NMR Unit,
[2] Institute of Neurology Queen Square UK-London WC1N3BG,undefined
[3] UK Tel.: +353-1-2695033 Fax: +353-1-2697949 e-mail: ntubridy@ion.ucl.ac.uk,undefined
[4] Department of Neurology St. Vincent’s Hospital,undefined
[5] Elm Park Dublin 4,undefined
[6] Ireland,undefined
[7] Department of Neurology Adelaide Hospital,undefined
[8] Peter Street Dublin 8,undefined
[9] Ireland,undefined