@article{Wunsch2006,
author = {Wunsch, H. and Linde-Zwirble, W.T. and Angus, D.C.},
title= {Methods to adjust for bias and confounding in critical care health services research involving observational data},
year = {2006},
doi = {10.1016/j.jcrc.2006.01.004},
journal = {Journal of Critical Care},
volume = {21},
number = {1},
pages = {1--7},
}