1. Angst J (1999) Major depression in 1998: are we providing optimal therapy? J Clin Psychiatry 60 (Suppl 6): 5–9
2. Cornwall PL, Scott J (2000) Which clinical practice guidelines for depression? An overview for busy practitioners. Br J Gen Pract 50: 908–911
3. Division of Mental Health (1990) CIDI-Core. Composite International Diagnostic Interview, Core Version 1.0-November 1990. WHO, Geneva
4. Fishbain DA, Cutler R, Rosomoff HL, Rosomoff RS (1997) Chronic pain-associated depression: antecedent or consequence of chronic pain? A review. Clin J Pain 13:116–137
5. Goldberg D, Williams P (1988) A Users Guide to the General Health Questionnaire: GHQ. NFER-Nelson, Windsor