@article{ref1,
title="Osteoporosis: the problem of its definition",
journal="Medicina clinica",
year="2005",
author="Sosa Henríquez, Manuel",
volume="124",
number="7",
pages="259-260",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0025-7753",
doi="",
url="http://dx.doi.org/"
}