Sarfraz, Tariq, et al. “FREQUENCY OF HELICOBACTER PYLORI IN HISTOLOGICALLY PROVEN GASTRITIS CASES - A STUDY OF 100 CASES: Helicobacter Pylori in Gastritis”. Pakistan Armed Forces Medical Journal, vol. 67, no. 3, June 2017, pp. 352-55, https://pafmj.org/PAFMJ/article/view/461.