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