Affiliation: | 1. Department of Cardiology and Internal Diseases, Specialistic Hospital, Gorlice, Poland;2. Department of Cardiology, 3. Interventional Electrocardiology and Hypertension, University Hospital, Cracow, Poland;4. Departments of Statistics, Cracow University of Economics, Cracow, Poland;5. Department of Cardiology, The Centre of Postgraduate Medical Education, Warsaw, Poland;6. Division of Cardiology, 7. Kingston General Hospital, Queen's University, Kingston, Ontario, Canada |