1. Department of Cardiology , University Hospital “Mother Teresa” , Tirana , Albania
2. University of Bergen, Faculty of Medicine and Dentistry , Department of Global Public Health and Primary Care , Kalfarveien 31, Bergen 5018 , Norway
3. Maastricht University, Faculty of Health, Medicine and Life Sciences, School for Public Health and Primary Care , Department of International Health , Maastricht The Netherlands
4. University of Gothenburg , Department of Public Health and Community Medicine , Gothenburg , Sweden
5. University of Medicine, Faculty of Medicine , Tirana , Albania