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Wang Y, Ye B, Wang M, Lin L, , Jiang L.  Esophageal Nocturnal Baseline Impedance and Post-reflux Swallow-induced Peristaltic Wave Index in Identifying Proton Pump Inhibitor-refractory Non-erosive Reflux Disease.  J Neurogastroenterol Motil 2021;27:525-532.  https://doi.org/10.5056/jnm20073