Butler-Fernández, K. M., Morales-Arocho, L. and Pedro-Gutiérrez, E. (2023) “Evaluation of the Timing of Opioid Administration: A Pilot Study”, Puerto Rico Health Sciences Journal, 42(1), pp. 77–80. Available at: https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/2855 (Accessed: 8 January 2026).