MACHAJ, Dominik, JASTRZĘBSKA, Sandra, CYBORAN, Katarzyna, PŁACZEK, Alicja and FLAUMENHAFT, Wiktoria. The incidence of infection, diagnosis and treatment of H. pylori in developing countries on the example of Kenya. Journal of Education, Health and Sport. Online. 4 March 2020. Vol. 10, no. 3, pp. 11-17. [Accessed 4 May 2024]. DOI 10.12775/JEHS.2020.10.03.001.