Affiliation: | 1. Section of Digestive Diseases, Department of Internal Medicine, University of Oklahoma Health Sciences Center, 920 Stanton Young Blvd. WP 1345, Oklahoma City, OK, 73104, USA 2. Veterans Affair Medical Center, Oklahoma City, OK, USA 3. Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, 200 Lothrop St, Pittsburgh, PA, 15213, USA
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