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Georgetown Univ, Med Ctr, Dept Med, Div Gastroenterol, 3800 Reservoir Rd NW,M2210, Washington, DC 20007 USA
Univ North Carolina Chapel Hill, Dept Med, Div Gastroenterol & Hepatol, Ctr Esophageal Dis & Swallowing, Chapel Hill, NC USA Georgetown Univ, Med Ctr, Dept Med, Div Gastroenterol, 3800 Reservoir Rd NW,M2210, Washington, DC 20007 USA