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From the following article

How to locate the lower esophageal sphincter and upper esophageal sphincter for pH recording

R. Shaker and C. Hofmann

GI Motility online (2006)

doi:10.1038/gimo91

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Video 1

Demonstration of the manometric techniques for localizing the upper and lower esophageal sphincters.

Full size video and legend (0K)
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