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Study flow diagram. PAH: pulmonary arterial hypertension; PVOD: pulmonary veno-occlusive disease; CHD: congenital heart disease; WHO FC: World Health Organization functional class; 6MWD: 6-min walk distance; BNP: brain natriuretic peptide; NT-proBNP: N-terminal pro-BNP. #: more than one reason for exclusion could apply.
