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Hann A, Lammert F, Walter S, Jansen PL; für die Kommission Lehre und Studium der DGVS; Kommission Lehre und Studium der DGVS.Hann A, et al.Z Gastroenterol. 2019 Sep;57(9):1124-1130. doi: 10.1055/a-0987-2211. Epub 2019 Sep 16.Z Gastroenterol. 2019.PMID: 31525803German.