1. Healthcare Quality Improvement Partnership. http://www.hqip.org.uk (accessed 18 Feb 2014).
2. Care Quality Commission. http://www.cqc.org.uk (accessed 18 Feb 2014).
3. Agency for Healthcare Research and Quality (AHRQ). http://www.ahrq.gov (accessed 18 Feb 2014).
4. The King's Fund. http://www.kingsfund.org.uk (accessed 18 Feb 2014).
5. The Health Foundation. http://www.health.org.uk (accessed 18 Feb 2014).