Tadege, T., Y. Mengistu, kassu Desta, and D. Asrat. “Seroprevalence of Helicobacter Pylori Infection in and Its Relationship With ABO Blood Groups”. The Ethiopian Journal of Health Development, vol. 19, no. 1, Dec. 2016, https://ejhd.org/index.php/ejhd/article/view/628.