@article{ref1,
title="Vitamin D insufficiency as a determinant of hip fractures",
journal="Osteoporosis international",
year="1996",
author="Quesada-Gómez, J. M. and Alonso, Jordi and Bouillon, Roger",
volume="6",
number="Suppl 3",
pages="42-47",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0937-941X",
doi="",
url="http://dx.doi.org/"
}