@article{ref1,
title="Three categories of nonprescription drug products to carry new warnings",
journal="Clinical pharmacy",
year="1993",
author="",
volume="12",
number="11",
pages="800-800",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0278-2677",
doi="",
url="http://dx.doi.org/"
}