1. Faculty of Economic Sciences and Management, Open University of Cyprus, 1304 Nicosia, Cyprus
2. Hypertension Unit, 1st Department of Internal Medicine, AHEPA University Hospital, 54636 Thessaloniki, Greece
3. Department of Health Services Organization and Management, National School of Public Health, 196 Alexandras Avenue, 11522 Athens, Greece
4. Centre for Health Services Management and Evaluation, Department of Nursing, University of Athens, 11527 Athens, Greece
5. Veterans Affairs Medical Center, Georgetown University, Washington, DC 20422, USA