There is no abstract for this article - please click the link below to read the article in its entirety. PMC ID: PMC1881451 (January 25, 1992)
British Medical Journal
1992
Berwick DM, Enthoven A and Bunker JP
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1881451/pdf/bmj00057-0045.pdf