@article{ref1,
title="Epidemiological testing of causal hypotheses: the case of mild head injury",
journal="Journal of developmental and behavioral pediatrics",
year="1996",
author="Rutter, M.",
volume="17",
number="3",
pages="183-185",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0196-206X",
doi="",
url="http://dx.doi.org/"
}