[1] Univ Munich, Dept Pediat Cardiol, D-81377 Munich, Germany
[2] Landesklinikum Wiener Neustadt, Dept Paediat, A-2700 Wiener Neustadt, Austria
[3] Univ Childrens Hosp, Dept Paediat Cardiol, A-8036 Graz, Austria
[4] Univ Helsinki, Childrens Hosp, Dept Paediat Cardiol, FIN-00029 Helsinki, Finland
[5] Merkezi Klin, AZ-1005 Baku, Azerbaijan
[6] Tech Univ Munich, Inst Prevent Paediat, D-80992 Munich, Germany