Olayinka, A. A., A. A. Abiodun, and A. I. Ishaq. 2020. “The Use of Cox and Piecewise Exponential Models in the Determination of Renal Failure”. Benin Journal of Statistics 3 (1): 91– 100. https://www.bjs-uniben.org/index.php/home/article/view/24.