Kerstis , Birgitta, Eva Nohlert, John Öhrvik, and Margareta Widarsson. 2016. “Association Between Depressive Symptoms and Parental Stress Among Mothers and Fathers in Early Parenthood: A Swedish Cohort Study”. Upsala Journal of Medical Sciences 121 (1):60–64. https://doi.org/10.3109/03009734.2016.1143540.