Institution: | 1. Gastrointestinal Endoscopy Unit, Department of Gastroenterology, Medical School of University of S?o Paulo, S?o Paulo, Brazil 2. Gastrointestinal Surgery Division, Department of Gastroenterology, Medical School of University of S?o Paulo, Av. Dr. Enéas de Carvalho Aguiar, S?o Paulo, SP, 05403-000, Brazil
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