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National Institute for Health and Care Excellence, London, UK
The American Health Quality Association, McLean, VA, USA
National Quality Forum, Washington, USA
Rockville, Maryland, USA
Journal, BioMed Central, London, UK
Journal, PubMed Central, National Library of Medicine, Bethesda, USA
Book, C. Pope, N. Mays, John Wiley & Sons, Inc., Hoboken, USA
Textbook, National Academy Press, Washington, USA, published 2005
National Guideline Clearinghouse, Rockville, USA
Journal, John Wiley & Sons, Inc., Hoboken, USA
U.S. Department of Health and Human Services, Rockville, USA