@article{ref1,
title="Factors related to risk of osteoporosis in 50-year-old women",
journal="Calcified tissue international",
year="1991",
author="Leino, A. and Impivaara, O. and Järvisalo, J. and Helenius, Hans",
volume="49",
number="Suppl",
pages="S76-S77",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0171-967X",
doi="",
url="http://dx.doi.org/"
}