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Sieg A, Kommerell B.Sieg A, et al.Klin Wochenschr. 1988 Nov 1;66(21):1099-101. doi: 10.1007/BF01711928.Klin Wochenschr. 1988.PMID: 2907064Clinical Trial.German.No abstract available.
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Sieg A, Metz W, Stiehl A, Raedsch R, Wysocki S, Kohlmeier M, Kommerell B.Sieg A, et al.Dtsch Med Wochenschr. 1986 Nov 14;111(46):1760-2. doi: 10.1055/s-2008-1068706.Dtsch Med Wochenschr. 1986.PMID: 3780440German.
Sieg A, Walker S, Czygan P, Gärtner U, Lanzinger-Rossnagel G, Stiehl A, Kommerell B.Sieg A, et al.Z Gastroenterol. 1983 Nov;21(11):644-50.Z Gastroenterol. 1983.PMID: 6362243Clinical Trial.