1 Department of Internal Medicine, Invasive Cardiology Division, University of Szeged, Semmelweis u. 8, Szeged 6725, Hungary.
2 Department of Cardiology, 'Niculae Stancioiu' Heart Institute, University of Medicine and Pharmacy 'Iuliu Hatieganu', Motilor 19-21, 400001 Cluj-Napoca, Romania.