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. 2011 Oct 20;343:d6387. doi: 10.1136/bmj.d6387

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© Frei et al 2011

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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graphic file with name frep860502.f2_default.jpg — Fig 2 Definition of study cohort and periods of collection of exposure data and follow-up for cancer outcome by age and time. Shaded area represents time span for which data on socioeconomic indicators were available for members of CANULI cohort