Guenaga KF, Otoch JP, Artifon ELA. Local staging of rectal carcinoma: endorectal ultrasound versus magnetic resonance imaging. Systematic review of literature and meta-analysis. Rev Gastroenterol Peru [nternet]. 2016 Jul. 17 [cited 2025 Apr. 9];36(1):43-8. vailable from: https://revistagastroperu.com/index.php/rgp/article/view/22