1. NHS dentistry: options for change. London: Department of Health, 2002.
2. Glaser B G, Strauss A L . The discovery of grounded theory. Hawthorne, NY: Aldine, 1967.
3. Newton J, Luce A, van Zwanenberg T, Firth-Cozens J. Job dissatisfaction and early retirement: a qualitative study of general practitioners in the Northern Deanery. Primary Health Care Research & Development. Volume 5. pp 68–76. Cambridge University Press, 2004.
4. Choosing health: making healthy choices easier. Department of Health, 2004.
5. Marshall M N, Mannion R, Nelson E, Davies H T . Managing change in the culture of general practice: qualitative case studies in primary care trusts. Br Med J 2003; 327: 599–602.