@article{ref1,
title="Evolution in state policy",
journal="Health affairs (Project Hope)",
year="2009",
author="",
volume="28",
number="3",
pages="792-792",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0278-2715",
doi="10.1377/hlthaff.28.3.792",
url="http://dx.doi.org/10.1377/hlthaff.28.3.792"
}