@article{ref1,
title="Commentary on Bryan Dowd's Paper "Separated at Birth: Statisticians, Social Scientists, and Causality in Health Services Research"",
journal="Health services research",
year="2011",
author="James O'Malley, A.",
volume="46",
number="2",
pages="430-436",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0017-9124",
doi="10.1111/j.1475-6773.2010.01232.x",
url="http://dx.doi.org/10.1111/j.1475-6773.2010.01232.x"
}