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Nasution, I.P.A. and Ruslie, R.H. 2022. The Difference in Serum Pepsinogen I, Pepsinogen II, Carcinoembryonic Antigen, and Carcinoma Antigen 72-4 Levels between Children with and without Helicobacter Pylori Infection. Open Access Macedonian Journal of Medical Sciences. 10, B (Apr. 2022), 1029–1032. DOI:https://doi.org/10.3889/oamjms.2022.9577.