1 Division of Geriatric Psychiatry, 1st Department of Psychiatry, Eginition Hospital, Athens Medical School, National and Kapodistrian University of Athens, Athens, Greece.
2 Department of Psychiatry, Johns Hopkins Medical School, Baltimore, MD, USA.
3 Department of Psychiatry, University Hospital of Rion, School of Medicine, University of Patras, Patras, Greece.
4 Department of Psychiatry and Psychotherapy, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany.
5 Department of Psychiatry, University General Hospital of Alexandroupolis, School of Medicine, Democritus University of Thrace, Alexandroupolis, Greece.