<h4>Objective</h4>To assess the effect of 25-hydroxyvitamin D (25-OHD) levels on pregnancy outcomes and birth variables.<h4>Design</h4>Systematic review and meta-analysis.<h4>Data sources</h4>Medline (1966 to August 2012), PubMed (2008 to August 2012), Embase (1980 to August 2012), CINAHL (1981 to A...
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