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Fritze D, Fritze J, Kaufmann M, Drings P.Fritze D, et al. Among authors: kaufmann m.Dtsch Med Wochenschr. 1978 Feb 17;103(7):306-8. doi: 10.1055/s-0028-1104427.Dtsch Med Wochenschr. 1978.PMID: 627193German.
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