Sangountrakul, A. . “The prevalence of Helicobacter pylori among patients with upper gastrointestinal symptoms”. Maharat Nakhon Ratchasima Hospital Journal, vol. 38, no. 3, Aug. 2024, pp. 151-6, https://he04.tci-thaijo.org/index.php/MNRHJ/article/view/1598.