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Background Combined multi-channel intra-luminal impedance and pH (Mll-pH) monitoring can detect gastro-esophageal reflux and identify acid and non-acid reflux (NAR) events. It can be used for patients with persistent symptoms who are having proton pump inhibitor (PPI) therapy. The aim of this study is to determine the frequency of acid reflux and NAR and to establish their relationship with persistent...
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