@article{ref1,
title="Effectiveness of hip protectors: effectiveness of studied hip protector was uncertain (letter)",
journal="British medical journal: BMJ",
year="2003",
author="Kannus, Pekka",
volume="326",
number="7395",
pages="930-930",
abstract="Abstract unavailable. (author reply p. 930)",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}