@article{ref1,
title="Sleep position and motor development",
journal="Journal of pediatrics",
year="2007",
author="Black, Stephen L.",
volume="151",
number="2",
pages="e7; author reply e7-8",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-3476",
doi="10.1016/j.jpeds.2007.03.053",
url="http://dx.doi.org/10.1016/j.jpeds.2007.03.053"
}