@article{ref1,
title="Football is the most popular sport worldwide",
journal="American journal of sports medicine",
year="2004",
author="Dvorak, Jiri and Junge, Astrid and Graf-Baumann, Toni and Peterson, Lars",
volume="32",
number="Suppl 1",
pages="3S-4S",
abstract="<p>[Abstract unavailable]  Keywords: Soccer</p> <p>Language: en</p>",
language="en",
issn="0363-5465",
doi="",
url="http://dx.doi.org/"
}