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. 2006 Oct 10;95(9):1269–1273. doi: 10.1038/sj.bjc.6603413

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Copyright © 2006 Cancer Research UK

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Cohort and period effects obtained from age–period and age–cohort analyses for keratinising carcinoma (A), non-keratinising carcinoma (B) and unknown type NPC (C) during the period 1988–2002 (in log scale).