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Univ N Carolina, Ctr Esophageal Dis & Swallowing, Ctr Gastrointestinal Biol & Dis, Div Gastroenterol & Hepatol,Dept Med,Sch Med, 130 Mason Farm Rd UNC CH, Chapel Hill, NC 27599 USA Univ N Carolina, Ctr Esophageal Dis & Swallowing, Ctr Gastrointestinal Biol & Dis, Div Gastroenterol & Hepatol,Dept Med,Sch Med, 130 Mason Farm Rd UNC CH, Chapel Hill, NC 27599 USA