1. Department of Health Promotion, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland;
2. Department of Cardiology and Internal Diseases, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland;
3. National Heart & Lung Institute, Imperial College, London, UK;
4. Department of Cardiology, Medical University of Vienna, Vienna, Austria