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http://www.sciencedirect.com/science/article/pii/S0946672X12000570
Recommendations for zinc intake during pregnancy and lactation vary widely across Europe. Using data on zinc intake and biomarkers of zinc status reported in randomized controlled trials (RCTs) and observational studies can provide estimates of dose–response relationships that may be used for underpinning zinc reference values.
Courtesy: Victoria et al., 2012