@article{ref1,
title="Bias in estimates of seat belt effectiveness",
journal="Injury prevention",
year="2003",
author="Koepsell, Thomas D. and Rivara, Frederick P. and Grossman, David C. and Mock, Charles",
volume="9",
number="1",
pages="91-92",
abstract="Abstract unavailable.",
language="en",
issn="1353-8047",
doi="",
url="http://dx.doi.org/"
}