A Randomized Study of Safety and Efficacy of Two Doses of Ambrisentan to Treat Pulmonary Arterial Hypertension in Pediatric Patients by Dunbar Ivy, MD, Maurice Beghetti, MD, Ernesto Juaneda-Simian, MD, PhD, Diane Miller, PhD, Mary Ann Lukas, MD, Chris Ioannou, PhD, Malek Okour, PhD, Jun Narita, MD, Rolf M.F. Berger, MD, PhD

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