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Case Western Reserve Univ, Esophageal & Swallowing Ctr, Div Gastroenterol & Hepatol, MetroHlth Med Syst, Cleveland, OH 44106 USA Case Western Reserve Univ, Esophageal & Swallowing Ctr, Div Gastroenterol & Hepatol, MetroHlth Med Syst, Cleveland, OH 44106 USA