@article{ref1,
title="Health surveillance strategy for professional footballers",
journal="British journal of sports medicine",
year="1997",
author="Mackay, G. Murray and McConnell, A. A.",
volume="31",
number="4",
pages="353-353",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0306-3674",
doi="",
url="http://dx.doi.org/"
}