Cabanillas, Fernando, Mariely Nieves-Plaza, Gerardo Quevedo, and Ignacio Echenique. “Rectal Adenocarcinoma: Proposal for a Model Based on Pretreatment Prognostic Factors”. Puerto Rico Health Sciences Journal 31, no. 2 (May 31, 2012). Accessed October 19, 2025. https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/785.