[1] Karl Franzens Univ Graz, Dept Neurol, A-8036 Graz, Austria
[2] Karl Franzens Univ Graz, MR Ctr, A-8036 Graz, Austria
[3] Vrije Univ Amsterdam, Med Ctr, Dept Radiol, NL-1081 HV Amsterdam, Netherlands
[4] Vrije Univ Amsterdam, Med Ctr, Dept Neurol, NL-1081 HV Amsterdam, Netherlands
[5] Huddinge Univ Hosp, Karolinska Inst, Dept Clin Neurosci, S-14186 Huddinge, Sweden
[6] Univ Florence, Dept Neurol & Psychiat Sci, I-50121 Florence, Italy
[7] Dept Clin Neurosci, Memory Res Unit, Helsinki, Finland