@article{ref1,
title="Effectiveness of regional trauma systems. Wrong comparisons were made",
journal="British medical journal: BMJ",
year="1998",
author="Parr, M. J. and Nolan, J. P.",
volume="316",
number="7141",
pages="1383-1384",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}