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Wolfseher U, Gertis K.Wolfseher U, et al. Among authors: gertis k.Gesund Ing. 1978 Nov;99(11):321-32.Gesund Ing. 1978.PMID: 738607German.No abstract available.
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Werner H, Gertis K.Werner H, et al. Among authors: gertis k.Gesund Ing. 1976 Jan-Feb;97(1-2):27-31.Gesund Ing. 1976.PMID: 1254166German.No abstract available.