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Forest plot for 6-min walk distance. The solid line indicates any effect; figure 4 presents data in absolute effects with minimally important difference thresholds and Grades of Recommendation, Assessment, Development, and Evaluation ratings. ERA: endothelin receptor antagonist; PDE5i: phosphodiesterase-5 inhibitor; PRA: prostacyclin receptor agonist; inh: inhalation; i.v.: intravenous.
