Association Between Maternal Folic Acid Supplementation and Congenital Heart Defects in Offspring in Birth Cohorts From Denmark and Norway by Nina Øyen, Sjurdur F. Olsen, Saima Basit, Elisabeth Leirgul, Marin Strøm, Lisbeth Carstensen, Charlotta Granström, Grethe S. Tell, Per Magnus, Stein E. Vollset, Jan Wohlfahrt, Mads Melbye

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