1. Dept. of General Cardiology, The National Institute of Cardiovascular Diseases, Bratislava, Slovak Republic
2. Dept. of Noninvasive Cardiology, Ss. Cyril and Methodius Hospital, University Hospital, Bratislava, Slovak Republic
3. 4th Dept. of Internal Medicine, Ss. Cyril and Methodius Hospital, University Hospital, Bratislava, Slovak Republic.