@article{ref1,
title="Football position and atopy--both subject to the birth order effect?",
journal="BMJ",
year="2003",
author="Perkin, Michael R.",
volume="327",
number="7429",
pages="1473-1474",
abstract="<p>[Abstract unavailable]  Keywords: Soccer</p> <p>Language: en</p>",
language="en",
issn="0959-535X",
doi="10.1136/bmj.327.7429.1473",
url="http://dx.doi.org/10.1136/bmj.327.7429.1473"
}