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A, B, Lines graphs showing 6MWD initially and at end of study for riociguat (A) (P < .025) and placebo (B) (P > .05). End-of-study visit for riociguat was more than 330 days for all but one patient who dropped out at 98 days. End-of-study visit for patients who received placebo ranged from 145 to 365 days, with five patients at less than 330 days. 6MWD = 6-min walk distance.
