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Ewald N, Bretzel RG.Ewald N, et al.Dtsch Med Wochenschr. 2012 May;137(19):997-8. doi: 10.1055/s-0032-1304893. Epub 2012 Apr 27.Dtsch Med Wochenschr. 2012.PMID: 22549256German.No abstract available.