1. Agency for Health Care Policy and Research. 2003 http://www.ahrq.gov/data/hcup/ccsicd10.htm
2. Agency for Healthcare Research and Quality (AHRQ). 2006 http://www.qualityindicators.ahrq.gov/
3. American College of Surgeons. 2006 https://acsnsqip.org/login/default.aspx
4. American Federation of Teachers. 2006 http://www.aft.org/healthcare/jcaho/index.htm
5. Audit Commission. 2001 http://www.audit-commission.gov.uk/reports/AC-REPORT.asp?Ca+ID=english%5EHEALTH&prodID=A9E075AF-7BCC-4529-BA78-F0D2F22034BC/