Ullah A, Ullah S, Ullah A, Sadiq M ud din, Khan M. FREQUENCY OF HELICOBACTER PYLORI IN PATIENTS PRESENTED WITH PERFORATED PEPTIC ULCER. J Postgrad Med Inst [Internet]. 2011 Aug. 9 [cited 2024 Nov. 22];21(1). Available from: https://jpmi.org.pk/index.php/jpmi/article/view/142