Barst, Robyn J A randomized, double-blind, placebo-controlled, dose-ranging study of oral sildenafil citrate in treatment-naive children with pulmonary arterial hypertension. [electronic resource] - Circulation Jan 2012 - 324-34 p. digital Publication Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't ISSN: 1524-4539 Standard No.: 10.1161/CIRCULATIONAHA.110.016667 doi Subjects--Topical Terms: Administration, OralAdolescentChildChild, PreschoolDose-Response Relationship, DrugDouble-Blind MethodExercise Test--drug effectsHemodynamics--drug effectsHumansHypertension, Pulmonary--drug therapyInfantOxygen Consumption--drug effectsPiperazines--administration & dosagePurines--administration & dosageSildenafil CitrateSulfones--administration & dosage