@article{ref1,
title="Migraine and childhood head trauma",
journal="Headache",
year="1995",
author="Friedrichs, E. S.",
volume="35",
number="3",
pages="169-169",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0017-8748",
doi="",
url="http://dx.doi.org/"
}