@article{ref1,
title="Assessment of head collision events during the 2014 FIFA world cup tournament",
journal="JAMA journal of the American Medical Association",
year="2017",
author="Cusimano, Michael D. and Casey, Julia and Jing, Ruiwei and Mishra, Anamika and Solarski, Michael and Techar, Kristina and Zhang, Shudong",
volume="317",
number="24",
pages="2548-2549",
abstract="<p>[Abstract unavailable]  Keywords: Soccer; Concussions</p> <p>Language: en</p>",
language="en",
issn="0098-7484",
doi="10.1001/jama.2017.6204",
url="http://dx.doi.org/10.1001/jama.2017.6204"
}