Ullah, Asad, Saif Ullah, Atta Ullah, Muzaffar ud din Sadiq, and Mumtaz Khan. “FREQUENCY OF HELICOBACTER PYLORI IN PATIENTS PRESENTED WITH PERFORATED PEPTIC ULCER”. Journal of Postgraduate Medical Institute 21, no. 1 (August 9, 2011). Accessed February 25, 2026. https://www.jpmi.org.pk/index.php/jpmi/article/view/142.