@article{Robins2000,
author = {Robins, J.M. and Hernan, M.A. and Brumback, B.},
title= {Marginal structural models and causal inference in epidemiology},
year = {2000},
doi = {10.1097/00001648-200009000-00011},
volume = {11},
number = {5},
pages = {550--560},
}