Herrera, Enrique, Eduardo Otero, Luis Hincapié, Rafael Camacho, Gustavo Gómez, Carlos Quintero, Célico Guzmán, and Paola Otero. “Heterotopic Pregnancy. Presentation of Four Cases”. Colombia Médica 42, no. 4 (1): 518-522. Accessed October 18, 2024. https://colombiamedica.univalle.edu.co/colombiamedica311/index.php/comedica/article/view/953.