López-García LJ, Ojeda A, Toro DH. Primary Duodenal Signet Ring Cell Carcinoma Presenting as Gastric Outlet Obstruction. PRHSJ [Internet]. 2009 Jun. 29 [cited 2025 Dec. 19];25(4). Available from: https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/292