TY - JOUR AU - Thoemmes, F J; West, S G TI - The use of propensity scores for nonrandomized designs with clustered data JO - Multivariate Behav Res VL - 46 PY - 2011 DO - 10.1080/00273171.2011.569395 L3 - PubMed-ID: 26735885 SP - 514 EP - 543 ER -