About 3ieThe International Initiative for Impact Evaluation (3ie) works to improve the lives of people in the developing world by supporting the production and use of evidence on what works, when, why and for how much.3ie is a new initiative that responds to demands for better evidence, and will enhance development effectiveness by promoting better informed policies.3ie finances high-quality impact evaluations and campaign to inform better program and policy design in developing countries.3ie Working Paper series covers both conceptual issues related to impact evaluation and findings from specific studies or synthetic reviews.
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Chambers et al. (2009) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: