@article{ref1,
title="Leisure-time physical activity and mortality: how is sausage made?",
journal="JAMA journal of the American Medical Association",
year="1998",
author="Ravenholt, R. T.",
volume="279",
number="20",
pages="1611-1611",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}