[1] Univ Heidelberg, Thoraxclin, Dept Pulm Hypertens, Heidelberg, Germany
[2] Univ Heidelberg, Dept Pediat Cardiol & Congenital Heart Dis, Heidelberg, Germany
[3] Tech Univ Munich, Dept Pediat Cardiol & Congenital Heart Dis, Munich, Germany
[4] Tech Univ Dresden, Dept Pneumol, D-01062 Dresden, Germany
[5] Univ Giessen & Marburg, Dept Pneumol, Giessen, Germany
[6] Univ Zurich Hosp, Pulm Hypertens Program, CH-8091 Zurich, Switzerland