@article{ref1,
title="Football, or soccer, as it is called in North America, is the most popular sport worldwide",
journal="American journal of sports medicine",
year="2000",
author="Dvorak, Jiri and Graf-Baumann, Toni and Peterson, L. and Junge, Astrid",
volume="28",
number="5 Suppl",
pages="S1-2",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0363-5465",
doi="",
url="http://dx.doi.org/"
}