Luangjaru, S. “Prevalence of Chromogranin A in Chronic Dyspepsia, IBS andChronic Diarrhea at Maharat Nakhon Ratchasima Hospital”. Maharat Nakhon Ratchasima Hospital Journal, vol. 35, no. 3, Sept. 2024, pp. 163-8, https://he04.tci-thaijo.org/index.php/MNRHJ/article/view/1759.