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Published by Oxford University Press on behalf of the International Epidemiological Association ß The Author 2010; all rights reserved. Advance Access publication 14 July 2010 International Journal of Epidemiology 2011;
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Published by Oxford University Press on behalf of the International Epidemiological Association ß The Author 2010; all rights reserved. Advance Access publication 14 July 2010 International Journal of Epidemiology 2011;