1. Clinic of General Internal Medicine and Clinic of Social and Family Medicine, School of Medicine, University of Crete, 71 110 Heraklion, Crete, Greece
2. Department of Social Medicine, School of Medicine, University of Crete, 71 110 Heraklion, Crete, Greece
3. Clinic of Social and Family Medicine, School of Medicine, University of Crete, 71 110 Heraklion, Crete, Greece
4. Psychiatric Clinic, Naval Hospital of Athens, 115 21 Athens, Greece
5. Department of Psychiatry, School of Medicine, University of Ioannina, 451 10 Ioannina, Greece