@article{ref1,
title="Further statistics in dentistry. Part 6: Multiple linear regression",
journal="British dental journal",
year="2002",
author="Petrie, A. and Bulman, J. S. and Osborn, J. F.",
volume="193",
number="12",
pages="675-682",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0007-0610",
doi="10.1038/sj.bdj.4801659",
url="http://dx.doi.org/10.1038/sj.bdj.4801659"
}