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Okamoto M, Oyasu R.Okamoto M, et al.Int J Cancer. 1996 Nov 27;68(5):616-21. doi: 10.1002/(SICI)1097-0215(19961127)68:5<616::AID-IJC11>3.0.CO;2-#.Int J Cancer. 1996.PMID: 8938144Free article.