Pathogenesis of proton-pump inhibitor-refractory non-erosive reflux disease according to multichannel intraluminal impedance-pH monitoring

Yukie Kohata^*, Yasuhiro Fujiwara, Hirohisa Machida, Hirotoshi Okazaki, Hirokazu Yamagami, Tetsuya Tanigawa, Kenji Watanabe, Toshio Watanabe, Kazunari Tominaga, Tetsuo Arakawa

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