Cadavid-Puentes AM, Bermúdez-Guerrero FJ, Giraldo-Salazar O, Muñoz-Zapata F, Otálvaro-Henao J, Ruíz-Sierra J, et al. Comparison of the effectiveness of fentanyl versus morphine for severe postoperative pain management. A randomized, double blind, clinical trial. Colomb. J. Anesthesiol. [Internet]. 2017 Apr. 1 [cited 2024 Apr. 24];45(2):100-7. Available from: https://www.revcolanest.com.co/index.php/rca/article/view/244