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In page Hiatal hernia:
"The incidence of hiatal hernia increases with age; approximately 60% of individuals aged 50 or older have a hiatal hernia.[1] Of these, 9% are symptomatic, depending on the competence of the lower esophageal sphincter (LES). 95% of these are "sliding" hiatal hernias, in which the LES protrudes above the diaphragm along with the stomach, and only 5% are the "rolling" type (paraesophageal), in which the LES remains stationary, but the stomach protrudes above the diaphragm.[citation needed]
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