@article{ref1,
title="Football: a case-based approach to mild traumatic brain injury",
journal="Pediatric annals",
year="2000",
author="Bernhardt, David T.",
volume="29",
number="3",
pages="172-176",
abstract="unavailable. Keywords: American football",
language="en",
issn="0090-4481",
doi="",
url="http://dx.doi.org/"
}