@article{ref1,
title="Unusual retained foreign body in the lung: a tree branch",
journal="European journal of cardio-thoracic surgery",
year="2007",
author="Tsang, Flora H. F. and Sihoe, Alan D. L. and Cheng, Lik-Cheung",
volume="31",
number="2",
pages="309-310",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1010-7940",
doi="10.1016/j.ejcts.2006.11.026",
url="http://dx.doi.org/10.1016/j.ejcts.2006.11.026"
}