L. . Acevedo Ortiz, D. Jaramillo Velásquez, and J. H. Donado Gómez, “Interim analysis in clinical trials: A meta-epidemiological study”, Med UPB, vol. 36, no. 2, pp. 133–137, Dec. 2017, doi: 10.18566/medupb.v36n2.a05.