1. Royal College of General Practitioners nMRCGP 12 competency areas in detail (RCGP, London) http://www.rcgp.org.uk/docs/nMRCGP_12 Competency Areas in detail.doc (accessed 6 Jun 2012).
2. Ryle JA (1948) The natural history of disease (Oxford University Press, Oxford), 2nd edn.
3. Balint M , ed (1970) Treatment or diagnosis: a study of repeat prescriptions in general practice (Tavistock Publications, London).
4. Treasure W (2011) Diagnosis and risk management in primary care: words that count, numbers that speak (Radcliffe Publishing, Abingdon).
5. Meador CK (2005) Symptoms of unknown origin (Vanderbilt University Press, Nashville, TN).