@article{ref1,
title="Defining a 'unit of harm'",
journal="Clinical radiology",
year="1989",
author="Russell, J. G.",
volume="40",
number="2",
pages="219-219",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-9260",
doi="",
url="http://dx.doi.org/"
}