@article{ref1,
title="Workers with disabling back pain",
journal="New England journal of medicine",
year="1997",
author="Hadler, N. M.",
volume="337",
number="5",
pages="341-343",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-4793",
doi="10.1056/NEJM199707313370511",
url="http://dx.doi.org/10.1056/NEJM199707313370511"
}