Vedran Velagić1, Richard Matasić2, Maja Čikeš2. 1. Department of Cardiovascular Medicine, University of Zagreb School of Medicine and University Hospital Centre Zagreb, Kišpatićeva 12, Zagreb 10000, Croatia vvelagic@gmail.com. 2. Department of Cardiovascular Medicine, University of Zagreb School of Medicine and University Hospital Centre Zagreb, Kišpatićeva 12, Zagreb 10000, Croatia.