@article{ref1,
title="Head injuries",
journal="British journal of sports medicine",
year="2005",
author="Dvorak, Jiri and Junge, Astrid and McCrory, Paul",
volume="39",
number="Suppl 1",
pages="i1-2",
abstract="Abstract unavailable.",
language="",
issn="0306-3674",
doi="10.1136/bjsm.2005.021188",
url="http://dx.doi.org/10.1136/bjsm.2005.021188"
}