scholarly article by Pål Surén et al published June 2013 in Obstetrical and Gynecological Survey
author: Mady Hornig, W. Ian Lipkin, George Davey Smith, Synnve Schjølberg, Ted Reichborn-Kjennerud, Michaeline Bresnahan, Camilla Stoltenberg, Margaretha Haugen, Per Magnus, Pål Surén, Anne-Siri Øyen, Christine Paul-Roth, Deborah Hirtz, Kari Kveim Lie, Ezra Susser
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