[1] Department of Neurology,
[2] Gentofte Hospital,undefined
[3] University of Copenhagen,undefined
[4] 2900 Hellerup,undefined
[5] Copenhagen,undefined
[6] Denmark,undefined
[7] e-mail: mbr@dadlnet.dk,undefined
[8] Tel.: +45-39773977,undefined
[9] Fax: +45-35393515,undefined