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Kruis W, Germer CT, Leifeld L; German Society for Gastroenterology, Digestive and Metabolic Diseases and The German Society for General and Visceral Surgery.Kruis W, et al.Digestion. 2014;90(3):190-207. doi: 10.1159/000367625. Epub 2014 Nov 19.Digestion. 2014.PMID: 25413249Review.