@article{ref1,
title="Heavy metal poisoning: mercury and lead",
journal="Annals of internal medicine",
year="1972",
author="",
volume="76",
number="5",
pages="779-792",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4819",
doi="",
url="http://dx.doi.org/"
}