Medical Care, Vol. 45, No. 10, Supplement 2: Comparative Effectiveness and Safety: Emerging Methods (Oct., 2007), pp. S143-S148 (6 pages) Background: In observational research, propensity score ...
This is a preview. Log in through your library . Abstract Cluster randomization trials with relatively few clusters have been widely used in recent years for evaluation of health-care strategies. On ...
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