Adverse events in hospitals: overview of key issues. Levinson DR. Washington, DC: US Department of Health and Human Services.
http://www.psnet.ahrq.gov/resource.aspx?resourceID=9302
Adverse events in hospitals: state reporting systems. Levinson DR. Washington, DC: US Department of Health and Human Services.
http://www.psnet.ahrq.gov/resource.aspx?resourceID=9303