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Propensity Score Adjustment With Multilevel Data: Setting Your Sites on Decreasing Selection Bias
Michael E. Griswold, PhD; A. Russell Localio, PhD; Cynthia Mulrow, MD, MSc, Senior Deputy Editor
Annals of Internal Medicine 2010;152:393-395. doi:10.7326/0003-4819-152-6-201003160-00010

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