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Tsukuma H, Ajiki W, Ioka A, Oshima A; Research Group of Population-Based Cancer Registries of Japan.Tsukuma H, et al.Jpn J Clin Oncol. 2006 Sep;36(9):602-7. doi: 10.1093/jjco/hyl068. Epub 2006 Jul 26.Jpn J Clin Oncol. 2006.PMID: 16870692