@article{ref1,
title="Measuring race and ethnicity: why and how?",
journal="JAMA journal of the American Medical Association",
year="2004",
author="Winker, Margaret A.",
volume="292",
number="13",
pages="1612-1614",
abstract="Abstract unavailable.",
language="",
issn="0098-7484",
doi="10.1001/jama.292.13.1612",
url="http://dx.doi.org/10.1001/jama.292.13.1612"
}