@article{ref1,
title="Mortality in ulcerative colitis: 1930 to 1966",
journal="Gastroenterology",
year="1969",
author="Morowitz, D. A. and Kirsner, J. B.",
volume="57",
number="5",
pages="481-490",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0016-5085",
doi="",
url="http://dx.doi.org/"
}