[1] Univ Hosp Larissa, Dept Nucl Med, Larisa, Greece
[2] Alexandra Univ Hosp, Dept Nucl Med, Athens, Greece
[3] IASIS Third Age Ctr, Athens, Greece
[4] Aeginition Hosp, Univ Psychiat Dept 1, Athens, Greece
[5] Evrokliniki, Dept Neurol, Athens, Greece
[6] Attikon Hosp, Univ Neurol Dept 2, Athens, Greece
[7] Med Ctr, Memory Disorders Clin, Athens, Greece