@article{ref1,
title="Empirical challenges in defining treatments and time in the evaluation of gun laws",
journal="Epidemiology",
year="2023",
author="Harper, Sam and Nandi, Arijit",
volume="34",
number="6",
pages="793-795",
abstract="[The publisher has not provided an abstract for this article.]  The first page of this article is freely available on the publshers website by following the DOI.<p /> <p>Language: en</p>",
language="en",
issn="1044-3983",
doi="10.1097/EDE.0000000000001663",
url="http://dx.doi.org/10.1097/EDE.0000000000001663"
}