@article{ref1,
title="Estimating costs of illness and injuries: a criticism",
journal="American journal of public health",
year="1981",
author="Kristein, M. M. and Sondik, E. J.",
volume="71",
number="12",
pages="1392-1393",
abstract="Abstract unavailable.",
language="",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}