Oliveros Rodríguez, Henry, Giancarlo Buitrago, and Paola Castellanos Saavedra. “Use of Matching Methods in Observational Studies With Critical Patients and Renal Outcomes. Scoping Review”. Colombian Journal of Anesthesiology 49, no. 2 (September 16, 2020). Accessed April 22, 2021. https://www.revcolanest.com.co/index.php/rca/article/view/944.