1. Laboratory of Epidemiology, Prevention & Management of Diseases; Nursing Department; Technological Educational Institute (TEI) of Crete; Crete Greece
2. Faculty of Nursing; Center for Health Services Management and Evaluation; National and Kapodistrian University of Athens; Athens Greece
3. Department of Social Medicine; Faculty of Medicine; University of Crete; Heraklion Greece
4. Faculty of Nursing; University of Athens; Athens Greece