1. Emergency Department, Naxos General Hospital-Health Centre, 84300 Naxos, Greece
2. 3rd Clinic of Internal Medicine, Papageorgiou Hospital, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. Clinic of Social and Family Medicine, Department of Social Medicine, School of Medicine, University of Crete, 70013 Heraklion, Greece
4. Clinic of Internal Medicine, Naxos General Hospital-Health Centre, 84300 Naxos, Greece
5. Multipurpose Regional Medical Centre of Donousa, 84300 Donousa, Greece
6. Laboratory of Primary Health Care, General Practice and Health Services Research, Faculty of Health Sciences, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece