Heterogeneity of DSM-IV Major Depressive Disorder as a Consequence of Subthreshold Bipolarity

P Zimmermann, T Bruckl, A Nocon, H Pfister, R Lieb, H. U Wittchen, F Holsboer and J. Angst

Archives of General Psychiatry 66 ( 12 ): 1341 - 1352 , 2009