Nasution IPA, Ruslie RH. 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 Maced J Med Sci [Internet]. 2022 Apr. 13 [cited 2024 May 2];10(B):1029-32. Available from: https://oamjms.eu/index.php/mjms/article/view/9577