Evaluating policy and service interventions: framework to guide selection and interpretation of study end points.

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@article{Lilford2010EvaluatingPA, title={Evaluating policy and service interventions: framework to guide selection and interpretation of study end points.}, author={Richard J. Lilford and Peter J Chilton and Karla Hemming and A. Girling and Celia A Taylor and Paul Barach}, journal={BMJ}, year={2010}, volume={341}, pages={c4413} }