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1 proximal esophageal pH & 1 distal esophageal pH channels, with impedance, infused or non-infused. 1 distal esophageal pH & 1 1 gastric pH channel, internal reference, with or without impedance. Single branch LPR catheters with distal & proximal pharyngeal impedance sensors surrounding a pH channel in addition to esophageal impedance & pH channels ................
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