Usefulness of Right-to-Left Shunting and Poor Exercise Gas Exchange for Predicting Prognosis in Patients With Pulmonary Arterial Hypertension by Oudiz, Ronald J., MD, Midde, Raghu, MD, Hovanesyan, Arsen, MD, Sun, Xing-Guo, MD, Roveran, Giorgio, MD, Hansen, James E., MD, Wasserman, Karlman, MD, PhD

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