@article{ref1,
title="Epidemiology of osteoporosis and its significance as a risk factor for fractures",
journal="Nihon Naika Gakkai Zasshi",
year="2005",
author="Fujiwara, Saeko",
volume="94",
number="4",
pages="614-618",
abstract="<p>[Abstract unavailable]</p><p>Language: ja</p>",
language="ja",
issn="0021-5384",
doi="",
url="http://dx.doi.org/"
}