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Hoffmann A, Grädel E, Hasse J, Pfisterer M, Burkart F, Burckhardt D.Hoffmann A, et al.Dtsch Med Wochenschr. 1983 Oct 21;108(42):1583-6. doi: 10.1055/s-2008-1069788.Dtsch Med Wochenschr. 1983.PMID: 6604625German.
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