@article{ref1,
title="Letter: A hypothesis about late walkers",
journal="Pediatrics",
year="1975",
author="Greene, G.",
volume="56",
number="5",
pages="840-840",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0031-4005",
doi="",
url="http://dx.doi.org/"
}