[1] Department of Radiology,
[2] Karl-Franzens Medical School and University Hospital Graz,undefined
[3] Auenbruggerplatz 9,undefined
[4] A-8036 Graz,undefined
[5] Austria Tel.: + 43-316-385 3850 Fax: + 43-316-385 3848,undefined
[6] Department of Neurosurgery,undefined
[7] Karl-Franzens Medical School and University Hospital Graz,undefined
[8] Auenbruggerplatz 9,undefined
[9] A-8036 Graz,undefined
[10] Austria,undefined