@article{ref1,
title="Letter: Risk ratios",
journal="Lancet",
year="1976",
author="Gormley, D. E.",
volume="1",
number="7968",
pages="1080-1080",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0140-6736",
doi="",
url="http://dx.doi.org/"
}