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. 2009 Apr 28;100(11):1806–1811. doi: 10.1038/sj.bjc.6605062

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Copyright © 2009 Cancer Research UK

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(A) Observational epidemiological study with follow-up data, (B) survival analysis ‘at risk’ set. (A) Study recruitment starts at R and ends at C. Date of diagnosis and event are indicated by Dx and E respectively. (B) Eligible cases are aligned by Dx on y axis of time since diagnosis. Dashed lines indicate unobserved time.