1. Agency for Healthcare Research & Quality 2014 Preventing pressure ulcers in hospitals: A tool kit for improving quality care http://www.ahrq.gov/professionals/systems/long-term-care/resources/pressure-ulcers/pressureulcertoolkit/index.html
2. Braden , B. Bergstrom , N. 1988 The Braden scale for predicting pressure sore risk http://www.bradenscale.com
3. Centers for Medicare and Medicaid Services 2004 CMS Manual System Pub. 100-07 State Operations Provider Certification: Revisions to appendix P (Survey protocols for long-term care facilities) appendix PP Guidance to surveyors for long-term care facilities https://www.cms.gov/Regulations-andGuidance/Guidance/Transmittals/downloads/R5SOM.pdf
4. Centers for Medicare and Medicaid Services 2006 Fact sheets: Eliminating serious, preventable and costly medical errors-never events http://www.cms.gov/Newsroom/MediaReleaseDatabase/Fact-Sheets/2006-Fact-Sheets-Items/2006-05-18.html