AustinPC. An introduction to propensity score methods for reducing the effects of confounding in observational studies. Multivariate Behav Res, 2011; 46:399–424.
2.
CurtisLH, HammillBG, EisensteinEL, et al.Using inverse probability-weighted estimators in comparative effectiveness analyses with observational databases. Med Care, 2007; 45:S103–S107.
