@article{ref1,
title="Lifetime risk of a hip fracture",
journal="American journal of public health",
year="1990",
author="Melton, L. J.",
volume="80",
number="4",
pages="500-501",
abstract="Abstract unavailable.",
language="",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}