@article{ref1,
title="Risk factors, sports medicine and the orthopedic system: an overview",
journal="Journal of sports medicine",
year="1975",
author="Nicholas, J. A.",
volume="3",
number="5",
pages="243-259",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-4201",
doi="",
url="http://dx.doi.org/"
}