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European Journal of Epidemiology > 2011 > 26 > 5 > 385-393
European Journal of Epidemiology > 2007 > 22 > 10 > 699-705
European Journal of Epidemiology > 2011 > 26 > 5 > 385-393
European Journal of Epidemiology > 2007 > 22 > 10 > 699-705