1. Department of Hygiene Social‐Preventive Medicine and Medical Statistics School of Medicine Aristotle University of Thessaloniki Thessaloniki Greece
2. Research Committee of Greek Association of General Practitioners Thessaloniki Greece
3. Department of Social Medicine Faculty of Medicine University of Crete Heraklion Crete Greece
4. Health Centre of N. Makri Athens Greece
5. Health Centre of Goura Goura Greece
6. 3rd Local Health Unit of Evosmos Thessaloniki Greece
7. Rural practice of Mavrommati Mavrommati Karditsa Greece
8. Rural Practice of Aiani Aiani Kozani Greece
9. School of Social Sciences Hellenic Open University Patra Greece