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Effect of cold water on 4-second integrated relaxation pressure (4s IRP) for single swallow (SS) and 20 mL multiple rapid swallows (MRS) in healthy subjects (HS), non-obstructive dysphagia (NOD) and achalasia patients. Data are expressed as ratio between 4s IRP after cold water and 4s IRP after room temperature water. Median and interquartile range are shown.
