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Conversion From Sildenafil to Tadalafil: Results From the Sildenafil to Tadalafil in Pulmonary Arterial Hypertension (SITAR) StudyFrantz, R. P.; Durst, L.; Burger, C. D.; Oudiz, R. J.; Bourge, R. C.; Franco, V.; Waxman, A. B.; McDevitt, S.; Walker, S. · Journal of Cardiovascular Pharmacology and Therapeutics · 2014