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    The Original Article was published on 17 October 2007

    In the Essay 'Big lessons for a healthy future' (Nature 449, 791–792; 2007) the conversion of £45.5 billion should have read US$93 billion, not million.

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    The online version of the original article can be found at 10.1038/449791a

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    Correction. Nature 450, 174 (2007).

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