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- [30] A Pilot Study Evaluating the Role of Combined Impedance-pH Monitoring in the Evaluation of Asian Patients With Suspected Supra-Esophageal Manifestations of Gastro-Esophageal Reflux Disease (GERD): Establishing the Presence of Acid and Non-Acid Reflux (NAR) GASTROENTEROLOGY, 2010, 138 (05) : S645 - S645