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Chang-Claude J, Becher H, Eby N, Bastert G, Wahrendorf J, Hamann U.Chang-Claude J, et al. Among authors: becher h.J Cancer Res Clin Oncol. 1997;123(5):272-9. doi: 10.1007/BF01208638.J Cancer Res Clin Oncol. 1997.PMID: 9201250