1. Department of Health Services Management, National School of Public Health, 196 Alexandras Avenue; 115 21 Athens, Greece
2. Department of Nursing Studies, University of Peloponnese, Efstathiou & Stamatikis Valioti and Plateon, 23100 Sparti, Greece
3. Administration, Athens Medical Group, Filadelfeos & Kefalariou 1, Square Kefalariou, 14562 Kifisia, Athens, Greece