Psychiatric comorbidity and functional impairment in a clinically referred sample of adults with attentiondeficit/hyperactivity disorder - Sobanski, E; Brüggemann, D; Alm, B; Kern, S; Deschner, M; Schubert, T; Philipsen, A; Rietschel, M (European Archives of Psychiatry and Clinical Neuroscience, 2007)