Figure 4 - The structure of the lower esophageal sphincter (LES).
From the following article
Pathophysiology of gastroesophageal reflux disease
Nicholas E. Diamant
GI Motility online (2006)
doi:10.1038/gimo21
GER, gastroesophageal reflux. (Source: Liebermann-Meffert D et al.61, with permission from American Gastroenterological Association.)
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