1. Nuclear Medicine Department, University Hospital of Larissa, Thessaly, Greece
2. Nuclear Medicine Department, “Alexandra” General Hospital, Athens, Greece
3. 3rd Age Day Care Center, IASIS, Athens, Greece
4. 1st University Psychiatric Department, Aeginition Hospital, Athens, Greece
5. Neurology Department, Evrokliniki, Athens, Greece
6. Medical Physics Department, Medical School, University of Thessaly, Thessaly, Greece
7. 2nd University Department of Neurology, Attikon Hospital, Athens, Greece
8. Memory Disorders Clinic, Medical Center, Athens, Greece