[1] Catholic Univ Louvain, Univ Hosp Gasthuisberg, Dept Cardiovasc Dis, B-3000 Louvain, Belgium
[2] Univ Oslo, Rikshosp, Univ Hosp, Dept Cardiol, N-0027 Oslo, Norway
[3] Ruhr Univ Bochum, Heart & Diabet Ctr NRW, Dept Cardiol, Bad Oeynhausen, Germany
[4] Med Univ Silesia, SCHD, Dpt Cardiol Congenital Heart Dis & Electrotherapy, Zabrze, Poland