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Figure 4 Kaplan-Meier estimates of survival. Median survival follow-up was 15 months (range 3 to 28 months) in the entire bosentan-treated group, 15 months (range 3 to 28 months) in the bosentan subgroup without concomitant prostanoid therapy, and 16 months in the bosentan subgroup with concomitant prostanoid therapy (range 5 to 27 months).
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