ECHAVARRÍA, H. R. Upper gastrointestinal bleeding. Colombia Medica, [S. l.], v. 20, n. 3, p. 110–123, 1989. DOI: 10.25100/cm.v20i3.6262. Disponível em: https://colombiamedica.univalle.edu.co/index.php/comedica/article/view/6262. Acesso em: 24 aug. 2024.