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First published online: 10 January 2018, Int J Epidemiol, 2018, doi: https://doi.org/10.1093/ije/dyx260
There was an error in the second paragraph of the section ‘Who is in the cohort?’. In the first sentence, the number of participants in 2011 was incorrectly reported as 7765. The correct number of participants in 2011 was 7926.
