AMAN, Z.; AFRIDI, V.; KHAN, J. Prevalnce of Helicobacter Pylori in Perforated Peptic ulcer. Journal of Postgraduate Medical Institute, [S. l.], v. 16, n. 2, 2011. Disponível em: https://www.jpmi.org.pk/index.php/jpmi/article/view/783. Acesso em: 26 apr. 2024.