@article{ref1,
title="Ptosis and proptosis following Valsalva maneuver",
journal="Aerospace medicine",
year="1969",
author="Chadduck, W. M. and Ames, B. A.",
volume="40",
number="6",
pages="670-671",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}