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Vitamin D status of pregnant women. Dots indicate the vitamin D status. The dotted vertical line represents the reference value. T0 = preconception; T1 = first trimester; T2 = second trimester. a = mean with standard deviation (SD); b = median with 95% range; c = mean with standard error of the means (SEM); d = median with minimum and maximum value. ABCD study [93]. Generation R study [92]. GLIMP2 study [50]. KOALA [91]. ZOOG [88].
