1. National Institute for Clinical Excellence (2004) Depression: management of depression in primary and secondary care (NICE guideline). Clinical guideline 23 (National Institute for Clinical Excellence, London).
2. World Health Organization (2006) International Statistical Classification of Diseases and Related Health Problems (World Health Organization, Geneva), 10th revision, http://www.who.int/classifications/apps/icd/icd10online/ (accessed 9 Aug 2007).
3. British Medical Association (2006) Quality and outcomes framework (British Medical Association, London) http://www.bma.org/ap.nsf (accessed 9 Aug 2007).
4. The PHQ-9
5. The Hospital Anxiety and Depression Scale