1. Department of Cardiology, Faculty of Medicine, College of Medicine, University of Warmia and Masuria, Olsztyn, Poland
2. Polish Hospital Federation, Warsaw, Poland
3. School of Public Health, Centre of Postgraduate Medical Education, Warsaw, Poland
4. Department of Human Capital Management, Cracow University of Economics, Krakow, Poland
5. Department of Psychology and Social Sciences in Medicine, Faculty of Medicine, College of Medicine, University of Warmia and Masuria, Olsztyn, Poland
6. National Cancer Institute, Bethesda, MD, USA