@article{ref1,
title="Expectoration of an occult foreign body six asymptomatic years after aspiration",
journal="Chest",
year="1993",
author="Pinals, M. and Pinals, D. and Tracy, J. D. and Brandstetter, R. D.",
volume="103",
number="6",
pages="1930-1931",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0012-3692",
doi="",
url="http://dx.doi.org/"
}