1 University Mental Health Research Institute, Athens, Greece.
2 First Department of Psychiatry, Medical School, National and Kapodistrian University of Athens, Eginition Hospital, Athens, Greece.
3 Faculty of Social and Political Sciences, University of Peloponnese, Corinth, Greece.
4 Centre for Health Services Research, Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National & Kapodistrian University, Athens, Greece.