Siregar, G. A., Halim, S., & Sitepu, R. R. (2015). Comparison of Endoscopic Findings with Gastroesophageal Reflux Disease Questionnaires (GerdQ) and Reflux Disease Questionnaire (RDQ) for Gastroesophageal Reflux Disease in Medan. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, 16(3), 143–147. https://doi.org/10.24871/1632015143-147