“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, vol. 56, no. 9, May 2022, https://doi.org/10.47895/amp.v56i9.5338.