Syed Abbas Ali Shah , Awais Ali Khan , Najam Hussain , Huma Aslam ; Naveed Abbas, Atta Ul Aleem Khalid 2014. Diagnostic Accuracy of Serology Testing for Helicobacter Pylori in Perforated Peptic Ulcer. Journal of Rawalpindi Medical College. 18, 2 (Dec. 2014).