A. M. T. Al-Brefkani, I. A. Naqid, N. B. Yahya, and N. Hussein, “Seroprevalence and risk factors associated with Helicobacter pylori infection among children aged less than 18 years old in Duhok Province, Iraq: Prevalence and risk factors for H. pylori infection”, J. Contemp. Med. Sci., vol. 7, no. 3, pp. 152–157, Jun. 2021.