Threshold level of Peptest in diagnosing gastroesophageal reflux disease with extraesophageal symptoms: Evidence from Vietnam by Linh T Nguyen, Tung D Le, Long B Hoang, Vung T Vu, Thang D Nguyen, Hue T M Luu, Phuong N Do, Anh Van Nguyen, Long Van Dao, Mattias Larsson, Linus Olson, Hang V Dao

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