Osorio-Gutiérrez, C. I., Ortiz-Gómez, G. A., Valencia-Ríos, J. F., & Arango-Gómez, F. (2020). Comparison among subarachnoid opioid mix for cesarean section – An observational study. Colombian Journal of Anesthesiology, 49(1). https://doi.org/10.5554/22562087.e940