1. Institute of Heart Disease, Wrocław University Hospital, Wroclaw Medical University, 50-556 Wrocław, Poland
2. Institute of Heart Diseases, University Hospital, 50-556 Wroclaw, Poland
3. Department of Cardiology, Poznan University of Medical Sciences, 61-701 Poznań, Poland
4. Department of Cardiology, Medical University of Bialystok, 15-089 Białystok, Poland