@article{ref1,
title="The limits of epidemiology",
journal="Journal of radiological protection",
year="1999",
author="Doll, Richard",
volume="19",
number="1",
pages="1-2",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0952-4746",
doi="",
url="http://dx.doi.org/"
}