Confocal Endomicroscopy for Permeability of Esophageal Wall in Refractory Gastroesophageal Reflux Disease (GERD)
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Correlation between the time from intravenous injection of fluorescein to visualization of fluorescein on probe based confocal endomicroscopy (pCLE) with esophageal permeability (i.e. - epithelial barrier function).
Timeframe: Through study completion, an average of 1 year.