@article{ref1,
title="Bariatric surgery and mortality",
journal="New England journal of medicine",
year="2007",
author="Beale, Mark",
volume="357",
number="25",
pages="2633-4; author reply 2634",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-4793",
doi="",
url="http://dx.doi.org/"
}