1. Department of Social Medicine, School of Medicine, University of Crete, 71500 Heraklion, Greece
2. Department of Nursing, School of Health Sciences, Hellenic Mediterranean University, 71410 Heraklion, Greece
3. Department of Primary Care and Population Health, Medical School, University of Nicosia, 2417 Nicosia, Cyprus
4. Department of Thoracic Medicine, University Hospital of Heraklion, School of Medicine, University of Crete, 71003 Heraklion, Greece