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Effect of posture on the separation of liquid and air in the swallowed bolus, (a) subject in the supine position where air and liquid surround the electrodes, (b) subject in the Trendelenburg position where air being lighter than liquid is located in the caudal and liquid in the cranial part of the bolus. Lines around the electrodes represent electrical field, which includes bolus, esophageal wall and structures outside the esophagus.
