@article{ref1,
title="Occupational health and safety surveillance. Work risks--a national occupational injury and illness surveillance system",
journal="Journal of occupational and environmental hygiene",
year="2004",
author="Greife, Alice",
volume="1",
number="11",
pages="D119-20",
abstract="Abstract unavailable.",
language="",
issn="1545-9624",
doi="",
url="http://dx.doi.org/"
}