@article{ref1,
title="Physical activity and injury. A study of sports injuries at the University of Toronto, 1951-1968",
journal="Journal of sports medicine and physical fitness",
year="1972",
author="MacIntosh, D. L. and Skrien, T. and Shephard, R. J.",
volume="12",
number="7",
pages="224-237",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4707",
doi="",
url="http://dx.doi.org/"
}