Al-Brefkani, A. M. T., Naqid, I. A., Yahya, N. B., & Hussein, N. (2021). 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. Journal of Contemporary Medical Sciences, 7(3), 152–157. https://doi.org/10.22317/jcms.v7i3.972