@article{ref1,
title="Principles in research on the effects of sports on health",
journal="JAMA journal of the American Medical Association",
year="1966",
author="Haddon, William",
volume="197",
number="11",
pages="885-888",
abstract="Abstract unavailable",
language="",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}