Anam, Ilum, et al. “The Difference of Gastric PH in Dyspepsia Patients With or Without Type 2 Diabetes Mellitus”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, vol. 16, no. 1, Apr. 2015, pp. 7-12, doi:10.24871/16120157-12.