1. http://jasonpriem.com/2010/10/medline-literature-growth-chart .
2. House of Lords Science and Technology Committee. 2009. Report Volume I: Report
3. Myocardial Ischaemia National Audit Project [MINAP]. How the NHS cares for patients with heart attack, ninth public report 2010. London: Royal College of Physicians
4. The Relation between Volume and Outcome in Health Care
5. Ewart H . The relation between volume and outcome in paediatric cardiac surgery. Public Health Resource Unit - A Literature Review for the National Specialised Commissioning Group 2009