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Klein PJ, Schaefer HE.Klein PJ, et al. Among authors: schaefer he.Z Krebsforsch Klin Onkol Cancer Res Clin Oncol. 1973;79(1):11-8. doi: 10.1007/BF00284335.Z Krebsforsch Klin Onkol Cancer Res Clin Oncol. 1973.PMID: 4281164German.No abstract available.