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. Published online December 10, 2022:3266-3274. Accessed June 21, 2026. https://www.pnrjournal.com/index.php/home/article/view/4563