@article{ref1,
title="Historical epidemiology",
journal="American journal of public health",
year="1963",
author="Rogers, F. B.",
volume="53",
number="",
pages="1694-1696",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}