Circulating 25‐Hydroxyvitamin D Levels During Pregnancy and Risk of Congenital Heart Diseases: Multivariable and Mendelian Randomization Analyses Using 3 Birth Cohorts by Karen Christina Walker, Ina O. Specht, Vibeke Hjortdal, Henrik T. Christesen, Berit L. Heitmann, Gillian Santorelli, Jane West, Per Magnus, Pål R. Njølstad, Elizabeth C. Corfield, Alexandra Havdahl, Maria Magnus, Kurt Taylor, Deborah A Lawlor

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