Sangountrakul, Atikom. 2024. “The prevalence of Helicobacter pylori among patients with upper gastrointestinal symptoms”. Maharat Nakhon Ratchasima Hospital Journal 38 (3). Nakhon Ratchasima,Thailand:151-56. https://he04.tci-thaijo.org/index.php/MNRHJ/article/view/1598.