Harahap, R.S., Delyuzar and Jessy Chrestella 2020. The Presence of Helicobacter pylori in cases of Chronic Tonsillitis in Medan. Sumatera Medical Journal. 3, 1 (Jan. 2020), 1-6. DOI:https://doi.org/10.32734/sumej.v3i1.2044.