@article{ref1,
title="Calcium, vitamin D, and hip fractures. Incidence of falls may have decreased",
journal="British medical journal: BMJ",
year="1994",
author="Mets, T.",
volume="309",
number="6948",
pages="193-193",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}