Additional file 1.
Funnel plots. Associations between (S1) intakes of total iron, heme iron, and risk of type 2 diabetes mellitus (T2DM) and (S2) associations between ferritin levels and risk of T2DM before and after adjusting for inflammatory markers.
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Bao et al. BMC Medicine 2012 10:119 doi:10.1186/1741-7015-10-119