@article{ref1,
title="Why so many injuries in professional football players?",
journal="Journal of sports medicine and physical fitness",
year="2013",
author="Volpi, P.",
volume="53",
number="1",
pages="101-102",
abstract="<p>[Abstract unavailable]  Keywords: Soccer </p> <p>Language: en</p>",
language="en",
issn="0022-4707",
doi="",
url="http://dx.doi.org/"
}