@article{ref1,
title="Prevalence of concussion among US adolescents and correlated factors",
journal="JAMA journal of the American Medical Association",
year="2017",
author="Veliz, Phil and McCabe, Sean E. and Eckner, James T. and Schulenberg, John E.",
volume="318",
number="12",
pages="1180-1182",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0098-7484",
doi="10.1001/jama.2017.9087",
url="http://dx.doi.org/10.1001/jama.2017.9087"
}