Comparison of Ketorolac and Indomethacin for the Closure of Patent Ductus Arteriosus among Preterm Infants Born at the Philippine General Hospital: A Randomized Controlled Crossover Design. Acta Med Philipp [Internet]. 2022 May 26 [cited 2025 Apr. 12];56(9). Available from: https://actamedicaphilippina.upm.edu.ph/index.php/acta/article/view/5338