@article{ref1,
title="Beware of the weaker sex: don't get too close to your twin brother",
journal="Pediatrics",
year="2007",
author="Stevenson, David K. and Tyson, Jon E.",
volume="120",
number="3",
pages="638-639",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-4005",
doi="10.1542/peds.2007-0950",
url="http://dx.doi.org/10.1542/peds.2007-0950"
}