• Birth prevalence of congenital heart defects in Norway 1994-2009—A nationwide study 

      Leirgul, Elisabeth; Fomina, Tatiana; Brodwall, Kristoffer; Greve, Gottfried; Holmstrøm, Henrik; Vollset, Stein Emil; Tell, Grethe Seppola; Øyen, Nina (Peer reviewed; Journal article, 2014-08-10)
      Background The reasons for decreasing birth prevalence of congenital heart defects (CHDs) in several European countries and Canada are not fully understood. We present CHD prevalence among live births, stillbirths, and ...
    • Paternal characteristics associated with maternal periconceptional use of folic acid supplementation 

      Mortensen, Jan Helge Seglem; Øyen, Nina; Nilsen, Roy Miodini; Fomina, Tatiana; Tretli, Steinar; Bjørge, Tone (Peer reviewed; Journal article, 2018-05-30)
      Background: Maternal predictors of folic acid (FA) supplementation use to reduce offspring risk of neural tube defects are well known, while paternal determinants for maternal FA use are less known. Such knowledge is ...
    • Periconceptional Folic Acid Supplementation and Infant Risk of Congenital Heart Defects in Norway 1999-2009 

      Leirgul, Elisabeth; Gildestad, Trude; Nilsen, Roy Miodini; Fomina, Tatiana; Brodwall, Kristoffer; Greve, Gottfried; Vollset, Stein Emil; Holmstrøm, Henrik; Tell, Grethe Seppola; Øyen, Nina (Peer reviewed; Journal article, 2015-07-24)
      Background The birth prevalence of congenital heart defects (CHDs) has decreased in Canada and Europe. Recommended intake of folic acid in pregnancy is a suggestive risk-reducing factor for CHDs. We investigated the ...
    • Supplemental folic acid in pregnancy and childhood cancer risk 

      Mortensen, Jan Helge Seglem; Øyen, Nina; Fomina, Tatiana; Melbye, Mads; Tretli, Steinar; Vollset, Stein Emil; Bjørge, Tone (Peer reviewed; Journal article, 2016)
      Background: We investigated the association between supplemental folic acid in pregnancy and childhood cancer in a nationwide study of 687 406 live births in Norway, 1999–2010, and 799 children diagnosed later with cancer. ...
    • Supplemental folic acid in pregnancy and maternal cancer risk 

      Mortensen, Jan Helge Seglem; Øyen, Nina; Fomina, Tatiana; Melbye, Mads; Tretli, Steinar; Vollset, Stein Emil; Bjørge, Tone (Peer reviewed; Journal article, 2015-12)
      Background: There is evidence that increased intake of folate protects against the development of several types of cancer. Some studies have, however, raised concern about the safety of folate in relation to cancer risk. ...