@article{ref1,
title="On the threshold",
journal="American journal of preventive medicine",
year="2002",
author="Broome, Claire V. and Pinner, Robert W. and Sosin, Dan M. and Treadwell, Tracee A.",
volume="23",
number="3",
pages="229-230",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0749-3797",
doi="",
url="http://dx.doi.org/"
}