Obstet Gynecol 2016 11;128(5):1116-1125
Departments of Global Public Health and Primary Care and Medical Science, University of Bergen, the Departments of Heart Disease and Pediatrics and the Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, and the Division of Epidemiology and the Division for Health Data and Digitalisation, Norwegian Institute of Public Health, Bergen, and the Department of Pediatrics, Oslo University Hospital, Oslo, Norway.