1. Center for Health Services Research, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
2. Department of Psychology, New York College, Athens, Greece
3. School of Social Sciences, Birmingham City University, Birmingham, UK
4. Counselling Center, Harokopio University, Athens, Greece
5. Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece