“…2 An evidence base regarding the patterns and correlates of comorbidity is therefore critical to our understanding of the pathogenesis of human chronic diseases and, consequently, central to their prevention and treatment. Systematic reviews of specific physical and/or mental disorders, [3][4][5][6][7][8][9][10][11] as well as studies of clinical [12][13][14][15][16] and community samples, [17][18][19][20][21][22][23][24][25][26] have also demonstrated both the co-occurrence and consequences of comorbidity in youth. However, much of the current evidence is based on cross-sectional assessment of small numbers of cases and self-reported disorders rather than systematic diagnostic assessments.…”