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Step-wedge cluster-randomised community-based trials: An application to the study of the impact of community health insurance.
De Allegri M, Pokhrel S, Becher H, Dong H, Mansmann U, Kouyaté B, Kynast-Wolf G, Gbangou A, Sanon M, Bridges J, Sauerborn R
Health Res Policy Syst 2008, 6:10
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Abolishing user fees in Africa.
Ridde V, Haddad S
PLoS Med 2009 Jan 6, 6:e1000008
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