@article{Foster2003,
author = {Foster, E.M.},
title= {Propensity score matching. An illustrative analysis of dose response},
year = {2003},
doi = {10.1097/01.MLR.0000089629.62884.22},
journal = {Medical Care},
volume = {41},
number = {10},
pages = {1183--1192},
}