Herrera E, Otero E, Hincapié L, Camacho R, Gómez G, Quintero C, Guzmán C, Otero P. Heterotopic pregnancy. Presentation of four cases. cm [Internet]. 1 [cited 17Sep.2024];42(4):518-22. Available from: https://colombiamedica.univalle.edu.co/colombiamedica311/index.php/comedica/article/view/953