[1] Cleveland Clin Fdn, Dept Gastroenterol & Hepatol, Ctr Swallowing & Esophageal Disorders, Cleveland, OH 44195 USA
[2] Cleveland Clin Fdn, Dept Clin Pathol, Ctr Swallowing & Esophageal Disorders, Cleveland, OH 44195 USA
[3] Cleveland Clin Fdn, Dept Anat Pathol, Ctr Swallowing & Esophageal Disorders, Cleveland, OH 44195 USA
[4] Cleveland Clin Fdn, Dept Canc Biol, Ctr Swallowing & Esophageal Disorders, Cleveland, OH 44195 USA