Ullah, A., Ullah, S., Ullah, A., Sadiq, M. ud din and Khan, M. (2011) “FREQUENCY OF HELICOBACTER PYLORI IN PATIENTS PRESENTED WITH PERFORATED PEPTIC ULCER”, Journal of Postgraduate Medical Institute, 21(1). Available at: https://www.jpmi.org.pk/index.php/jpmi/article/view/142 (Accessed: 3 May 2024).