Mixed depression in bipolar disorder: prevalence rate and clinical correlates during naturalistic follow up Suppes, T., Hellemann, G., Frye, M., McElroy, S., Nolen, W., Kupka, R., Leverich, G., Grunze, H., Altshuler, L., Keck, P., Post, R. WILEY-BLACKWELL. 2009: 83–84

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