@article{ref1,
title="Ridit analysis and related ranking procedures--use at your own risk",
journal="American journal of epidemiology",
year="1979",
author="Mantel, N.",
volume="109",
number="1",
pages="25-29",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-9262",
doi="",
url="http://dx.doi.org/"
}