@article{ref1,
title="Sudden death while playing professional football",
journal="American heart journal",
year="1981",
author="Roberts, W. C. and Maron, B. J.",
volume="102",
number="6 Pt 1",
pages="1062-1063",
abstract="<p>[Abstract unavailable]  KW: American football</p> <p>Language: en</p>",
language="en",
issn="0002-8703",
doi="10.1016/0002-8703(81)90490-7",
url="http://dx.doi.org/10.1016/0002-8703(81)90490-7"
}