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Sieg A, Walker S, Czygan P, Gärtner U, Lanzinger-Rossnagel G, Stiehl A, Kommerell B.Sieg A, et al. Among authors: walker s.Z Gastroenterol. 1983 Nov;21(11):644-50.Z Gastroenterol. 1983.PMID: 6362243Clinical Trial.