ULLAH, Asad; ULLAH, Saif; ULLAH, Atta; SADIQ, Muzaffar ud din; KHAN, Mumtaz. FREQUENCY OF HELICOBACTER PYLORI IN PATIENTS PRESENTED WITH PERFORATED PEPTIC ULCER. Journal of Postgraduate Medical Institute, [S. l.], v. 21, n. 1, 2011. Disponível em: https://www.jpmi.org.pk/index.php/jpmi/article/view/142. Acesso em: 6 jun. 2025.