Sumreen, Muhammad Daud, Sham Lal Prithiani, Sheema Khan, Nadeem Sharif, Ifrah Zafar, “Association of Helicobacter pylori Infection with Severity and Clinical Presentation of Gastric Ulcer: A Cross-Sectional Clinical Study”, Pakistan Journal of Medical & Health Sciences, vol. 18, no. 01, p. 769, Jan. 2024.