1. Akiskal HS (1990) Toward a clinical understanding of the relationship of anxiety and depressive disorders. In: Maser JD, Cloninger CR (eds) Comorbidity of mood and anxiety disorders. American Psychiatric Press Inc., Washington, DC, pp 597–607
2. American Psychiatric Association (1994) Diagnostic and Statistical Manual for Mental Disorders. (4th edn.) (DSM-IV), APA press, Washington, DC
3. Andreasen NC (1982) Concepts, diagnosis and classification. In: Paykel ES (ed) Handbook of affective disorders. Guilford Press, New York, pp 24–44
4. Angelino AF, Treisman GJ (2001) Major depression and demoralization in cancer patients: diagnostic and treatment considerations. Support Care Cancer 9:344–349
5. Blazer D, Woodbury M, Hughes HC, George LK, Manton KG, Bachar JR, Fowler N (1989) A statistical analysis of the classification of depression in a mixed community and clinical sample. J Affect Dis 16:11–20