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Sperk E, Welzel G, Keller A, Kraus-Tiefenbacher U, Gerhardt A, Sütterlin M, Wenz F.Sperk E, et al. Among authors: welzel g.Breast Cancer Res Treat. 2012 Aug;135(1):253-60. doi: 10.1007/s10549-012-2168-4. Epub 2012 Jul 29.Breast Cancer Res Treat. 2012.PMID: 22842984Clinical Trial.