@article{ref1,
title="Commentary: Applying a causal road map in settings with time-dependent confounding",
journal="Epidemiology",
year="2014",
author="Petersen, Maya L.",
volume="25",
number="6",
pages="898-901",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1044-3983",
doi="10.1097/EDE.0000000000000178",
url="http://dx.doi.org/10.1097/EDE.0000000000000178"
}