title: Community clinics for leg ulcers: Critique III.
abstract: In order to attribute cause and effect with confidence, the design of a clinical evaluation needs certain characteristics. The fundamental requirement of any evaluation of a health-care intervention is that the outcomes should be attributable to the treatment and not to other factors such as chance or differences between patients.
authors.affiliation: Research fellow, Centre for Health Economics, University of York.
authors.forename: A
authors.initials: A
authors.lastname: Fletcher