] .
2009. The essential role of pair matching in cluster-randomized experiments, with application to the Mexican universal health insurance evaluation. Statistical Science. 24:29–53.
.
2009. Public policy for the poor? A randomised assessment of the Mexican universal health insurance programme The lancet. 373:1447–1454.
.
2009. Public policy for the poor? A randomised assessment of the Mexican universal health insurance programme The Lancet. 373:1447–1454.
.
2009. Rejoinder: Matched Pairs and the Future of Cluster-Randomized Experiments. Statistical Science. :65–72.