@article{ref1,
title="Is "natural" always healthy?",
journal="Journal of school health",
year="1980",
author="Kaufman, M. R. and Siek, T.",
volume="50",
number="6",
pages="322-325",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-4391",
doi="",
url="http://dx.doi.org/"
}