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Rankograms of epoprostenol, treprostinil, iloprost, beraprost, and placebo according to 6-min walk distance (A), all-cause mortality (B), functional class amelioration (C), and discontinuation (D). The 5 ranks on the vertical horizontal axis are shown in diverse colors: red (rank 1), thallite (rank 2), green (rank 3), blue (rank 4), and purple (rank 5). The corresponding ranking probabilities are on the vertical axis.
