@article{ref1,
title="Cluster: a potentially lethal headache disorder",
journal="Headache",
year="2006",
author="Rothrock, John",
volume="46",
number="2",
pages="327-327",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0017-8748",
doi="10.1111/j.1526-4610.2006.00346.x",
url="http://dx.doi.org/10.1111/j.1526-4610.2006.00346.x"
}