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Patient flowchart. PAH: pulmonary arterial hypertension; PVOD: pulmonary veno-occlusive disease; CHD: congenital heart disease; POPH: portopulmonary hypertension; WHO/NYHA FC: World Health Organization/New York Heart Association Functional Class; 6MWD: 6-min walk distance; BNP: brain natriuretic peptide; NT-proBNP: N-terminal pro-BNP; RHC: right heart catheterisation.
