[1] Democritus Univ Thrace, Med Sch, Dept Neurol, Alexandroupolis 68100, Greece
[2] Hellen Neuropsychol Soc, Athens, Greece
[3] Athens Alzheimers Assoc, Athens, Greece
[4] Univ Mental Hlth, Neurosci & Precis Med Res Inst Costas Stefanis, Lab Cognit Neurosci & Sensorimotor Control, Athens, Greece
[5] Natl & Kapodistrian Univ Athens, Aiginit Hosp, Med Sch, Dept Neurol 1, Athens, Greece
[6] Natl & Kapodistrian Univ Athens, Evangelismos Hosp, Sch Med, Crit Care Dept 1,Clin Ergospirometry Exercise & R, Athens, Greece
[7] Natl & Kapodistrian Univ Athens, Sci Coll Greece, Sch Hlth Sci, Dept Med,Lab Cognit Neurosci & Clin Neuropsychol, Athens, Greece
[8] Columbia Univ, Irving Med Ctr, Cognit Neurosci Div, New York, NY USA