@article{ref1,
title="Problems in analyzing helicopter emergency medical service accidents",
journal="Journal of trauma and acute care surgery",
year="2014",
author="Hinkelbein, Jochen and Neuhaus, Christopher and Braunecker, Stefan",
volume="77",
number="5",
pages="799-800",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="2163-0755",
doi="10.1097/TA.0000000000000386",
url="http://dx.doi.org/10.1097/TA.0000000000000386"
}