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Sildenafil in severe pulmonary hypertension associated with chronic obstructive pulmonary disease: A randomized controlled multicenter clinical trial

HypertensionPulmonary Arterial HypertensionCardiovascular DiseaseSevere Pulmonary HypertensionPulmonary PharmacologyPulmonary HypertensionPharmacotherapyPulmonary MedicinePublic HealthMedicinePulmonary DiseasePulmonary Vascular DiseaseAnesthesiology