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Schlierf G, Kahlke W.Schlierf G, et al. Among authors: kahlke w.Dtsch Med Wochenschr. 1969 Feb 14;94(7):329-32. doi: 10.1055/s-0028-1108953.Dtsch Med Wochenschr. 1969.PMID: 5762992German.No abstract available.