Harahap, Rini Syahrani, Delyuzar, and Jessy Chrestella. “The Presence of Helicobacter Pylori in Cases of Chronic Tonsillitis in Medan”. Sumatera Medical Journal 3, no. 1 (January 29, 2020): 1–6. Accessed August 5, 2025. https://idjpcr.usu.ac.id/smj/article/view/2044.