@article{Fewell2004,
author = {Fewell, Z. and Hernan, M.A. and Wolfe, F. and Tilling, K. and Choi, H. and Sterne, J.A.C.},
title= {Controlling for time-dependent confounding using marginal structural models},
year = {2004},
doi = {10.1177/1536867X0400400403},
volume = {4},
pages = {402--420},
}