?:authorAffiliation
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[\'1Department of Gastroenterology, Corporal Michael J. Crescenz VA Medical Center, Philadelphia, Pennsylvania, USA; 2Division of Gastroenterology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania, USA; 3Center of Clinical Epidemiology and Biostatistics, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania, USA; 4Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania, USA.\']
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