1.
Ystrom E, Reichborn-Kjennerud T, Tambs K, Magnus P, Torgersen AM, Gustavson K. Multiple births and maternal mental health from pregnancy to 5 years after birth: A longitudinal population-based cohort study. Nor J Epidemiol [Internet]. 2014Dec.29 [cited 2020Aug.5];24(1-2). Available from: https://www.ntnu.no/ojs/index.php/norepid/article/view/1823