2022. 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 Medica Philippina. 56, 9 (May 2022). DOI:https://doi.org/10.47895/amp.v56i9.5338.