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