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Sieg A, Schönpflug A, Seitz HK, Kommerell B.Sieg A, et al. Among authors: kommerell b.Z Gastroenterol. 1991 Mar;29(3):101-4.Z Gastroenterol. 1991.PMID: 1647573German.
Sieg A, Kommerell B.Sieg A, et al. Among authors: kommerell b.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, Stiehl A, Heirwegh KP, Fevery J, Raedsch R, Kommerell B.Sieg A, et al. Among authors: kommerell b.Hepatology. 1989 Jul;10(1):14-20. doi: 10.1002/hep.1840100104.Hepatology. 1989.PMID: 2737598