Is liability to recurrent major depressive disorder present before first episode onset in adolescence or acquired after the initial episode?

Journal of Abnormal Psychology (2013) - Comment
pubmed: 23713498 doi: 10.1037/a0032655 issn: 1939-1846 issn: 0021-843x

Jeremy W. Pettit, Chelsey Hartley, Peter M. Lewinsohn, John R. Seeley, Daniel N. Klein