عوامة محمد, مخلوف سامر, and كرميا زين العابدين. “A Study of the Relationship Between CA 19-9 Level and Infection With H. Pylori in Patients With Benign Gastrointestinal Diseases”. Tishreen University Journal -Medical Sciences Series 43, no. 1 (March 9, 2021). Accessed November 24, 2024. https://journal.tishreen.edu.sy/index.php/hlthscnc/article/view/10408.