Pakdirat, P., K. Atisook, and C. Kositchaiwat. “Histologic Identification of Helicobacter pylori and Gastric Pathology in Endoscopic Biopsy Specimens: A Report of 213 cases”. Siriraj Medical Journal, vol. 53, no. 8, Aug. 2020, pp. 466-73, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/244849.