Simadibrata, Marcellus, Aziz Rani, Pangestu Adi, Ali Djumhana, and Murdani Abdullah. “The Gastro-Esophageal Reflux Disease Questionnaire Using Indonesian Language: A Language Validation Survey”. Medical Journal of Indonesia 20, no. 2 (May 1, 2011): 125-30. Accessed July 23, 2024. http://mji.ui.ac.id/journal/index.php/mji/article/view/442.