@article{ref1,
title="Safety of subaqua diving with a patent foramen ovale",
journal="British medical journal: BMJ",
year="1992",
author="Cross, S. J. and Evans, S. A. and Thomson, L. F. and Lee, H. S. and Jennings, K. P. and Shields, T. G.",
volume="304",
number="6825",
pages="481-482",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}