@article{ref1,
title="Caution should be used in applying propensity scores estimated in a full cohort to adjust for confounding in subgroup analyses: Commentary on "Applying propensity scores estimated in a full cohort to adjust for confounding in subgroup analyses"",
journal="Pharmacoepidemiology and drug safety",
year="2012",
author="Marcus, S.M. and Gibbons, R.D.",
volume="21",
number="7",
pages="710-712",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1053-8569",
doi="10.1002/pds.3202",
url="http://dx.doi.org/10.1002/pds.3202"
}