@article{ref1,
title="Assessing exposure time and concussion risk",
journal="American journal of public health",
year="2018",
author="Bachynski, Kathleen E. and Swedler, David I.",
volume="108",
number="7",
pages="e12-e12",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0090-0036",
doi="10.2105/AJPH.2018.304442",
url="http://dx.doi.org/10.2105/AJPH.2018.304442"
}