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Ukena D, Sybrecht GW.Ukena D, et al. Among authors: sybrecht gw.Dtsch Med Wochenschr. 1988 Oct 21;113(42):1651-6. doi: 10.1055/s-2008-1067867.Dtsch Med Wochenschr. 1988.PMID: 2846251Review.German.No abstract available.