1. University of Groningen, University Medical Center Groningen, Department of Epidemiology, Groningen, The Netherlands
2. Alexandria University, Faculty of Nursing, Department of Emergency and Critical Care Nursing, Alexandria, Egypt
3. University of Groningen, University Medical Center Groningen, Department of Community & Occupational Medicine, The Netherlands
4. East Slovakian Institute for Cardiac and Vascular Diseases, Kosice, Slovakia
5. Cardiocentre of Teaching Hospital of J.A. Reiman, Prešov, Slovakia
6. Pavol Jozef Safarik University, Faculty of Medicine, Graduate School Kosice Institute for Society and Health, Kosice, Slovak Republic