@article{ref1,
title="Patent ductus arteriosus in flying personnel",
journal="Aerospace medicine",
year="1962",
author="Welch, C. O. and Lamb, L. E.",
volume="33",
number="",
pages="1370-1374",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}