1. First Department of Cardiology, Interventional Electrocardiology and Hypertension Jagiellonian University Medical College Kraków Poland
2. Department of Cardiology H. Klimontowicz Specialistic Hospital Gorlice Poland
3. Department of Cardiology, Third Faculty of Medicine Charles University and University Hospital Kralovske Vinohrady Prague Czech Republic
4. Geisinger Heart Institute Geisinger Commonwealth School of Medicine Wilkes‐Barre Pennsylvania USA