@article{Kainz2017,
author = {Kainz, K. and Greifer, N. and Givens, A. and Swietek, K. and Lombardi, B.M. and Zietz, S. and Kohn, J.L.},
title= {Improving causal inference: Recommendations for covariate selection and balance in propensity score methods},
year = {2017},
doi = {10.1086/691464},
volume = {8},
number = {2},
pages = {279--303},
}