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Schleenvoigt BT, Keller PM, Lehmann M, Gras F, Hagel S, Stallmach A, Pletz MW.Schleenvoigt BT, et al. Among authors: hagel s.Dtsch Med Wochenschr. 2013 Nov;138(45):2297-302. doi: 10.1055/s-0033-1349614. Epub 2013 Oct 25.Dtsch Med Wochenschr. 2013.PMID: 24163165German.