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Richter JE, Bradley LA, DeMeester TR, Wu WC. Normal 24 hour ambulatory esophageal pH values: Influence of study center, pH electrode, age and gender. Dig Dis Sci 1992; 37:849 56. 94. Singh S, Richter JE. Is it physiological to have a pH electrode across the lower esophageal sphincter? Dig Dis Sci 1992; 37:667 72. 95. ................
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