@article{ref1,
title="Letter: Hang gliding",
journal="JAMA journal of the American Medical Association",
year="1975",
author="",
volume="234",
number="12",
pages="1220-1221",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}