1. Department of Cardiac Rehabilitation and Noninvasive Electrocardiology; Institute of Cardiology; Alpejska 42 Warsaw 04-628 Poland
2. Department of Heart Failure; Institute of Cardiology; Warsaw Poland
3. Echocardiography Laboratory; Institute of Cardiology; Warsaw Poland
4. First Department of Coronary Artery Disease; Institute of Cardiology; Warsaw Poland
5. Statistics Laboratory; Institute of Cardiology; Warsaw Poland