@article{ref1,
title="Physicians' warnings for unfit drivers and risk of road crashes",
journal="New England journal of medicine",
year="2013",
author="Porter, Michelle M. and Marshall, Shawn C. and Bedard, Michel",
volume="368",
number="1",
pages="87-87",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0028-4793",
doi="10.1056/NEJMc1212928#SA2",
url="http://dx.doi.org/10.1056/NEJMc1212928#SA2"
}