1. From the Kerckhoff-Klinik, Department of Cardiology and Cardiosurgery (V.M.), Bad Nauheim, Germany; Klinicki Center Serbia (P.S.), Institut za kardiovaskularne bolest, Belgrad; Medicinski Facultet Uni Novi Sad (S.D.), Institut za kardiovaskularne bolest, Sremska Kamenica; Clinical Centre Bezanijska Kosa, Department of Cardiology (M.K.), Zemum; Dedinje Cardiovascular Institute Milana Tepica 1 (A.N.), Belgrade, Serbia; Stavanger Universitetssykehus Kardiologisk divisjon (K.D.), Stavanger, Norway;...