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To determine the pregnancy outcome as a function of the first-trimester serum 25-hydroxyvitamin D 3 [25(OH)D] status and to compare the 25(OH)D levels in the first and third trimesters.Pregnant women (n=466) tested for serum 25(OH)D levels during the first trimester were followed up until the end of pregnancy, and the obstetric and neonatal outcomes were compared in reference to the baseline...