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The trajectory of 6‐minute walk distance change from baseline at 6 months and 12 months for individual patients enrolled in the study. (a) Line series illustrating the absolute 6‐minute walk distance (6‐MWD) achieved at baseline and at 6 months and (b) at baseline, 6 and 12 months for patients enrolled throughout the study duration. Patients are stratified by the randomization group: daily placebo or tadalafil 40 mg daily per os
