J., S. L.; CHANNADASAR, S. Risk factors and seasonal trends of duodenal ulcer perforation. International Surgery Journal, [S. l.], v. 3, n. 2, p. 876–878, 2016. DOI: 10.18203/2349-2902.isj20160670. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/201. Acesso em: 20 feb. 2026.