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Risk assessment and treat-to-target approach for pulmonary arterial hypertension. WHO-FC: World Health Organization-functional class; 6MWD: 6-min walking distance; CPET: cardiopulmonary exercise testing; Echo: echocardiography; BNP: brain natriuretic peptide; NT-proBNP: N-terminal-pro-brain natriuretic peptide. Adapted from [15] with permission from the publisher.
