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Gong EJ, Jung KW, Min YW, Hong KS, Jung HK, Son HJ, Kim DY, Lee J, , Lee OY.  Validation of the Korean Version of the Gastroesophageal Reflux Disease Questionnaire for the Diagnosis of Gastroesophageal Reflux Disease.  Journal of Neurogastroenterology and Motility 2019;25:91-99.  https://doi.org/10.5056/jnm18133