@article{ref1,
title="Before-after paired data",
journal="International journal of injury control and safety promotion",
year="2013",
author="Bangdiwala, Shrikant I.",
volume="20",
number="3",
pages="302-304",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1745-7300",
doi="10.1080/17457300.2013.823017",
url="http://dx.doi.org/10.1080/17457300.2013.823017"
}