@article{ref1,
title="Exercise and risk of hip fracture in postmenopausal women",
journal="Clinical journal of sport medicine",
year="2004",
author="Macera, Caroline A.",
volume="14",
number="2",
pages="103-104",
abstract="Abstract unavailable.",
language="",
issn="1050-642X",
doi="",
url="http://dx.doi.org/"
}