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COMPARISON OF THE EFFECT OF SILDENAFIL AND TADALAFIL ON PULMONARY HYPERTENSION ASSOCIATED WITH HEMODYNAMICALLY SIGNIFICANT PDAS TREATMENT OF PULMONARY HYPERTENSION IN HS-PDA PATIENTS. Journal of Pharmaceutical Negative Results 2022, 3266-3274. https://doi.org/10.47750/pnr.2022.13.S08.401.