@article{ref1,
title="The gross motor function classification system: 20 years on",
journal="Developmental medicine and child neurology",
year="2017",
author="McCormick, Anna",
volume="59",
number="6",
pages="571-571",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0012-1622",
doi="10.1111/dmcn.13397",
url="http://dx.doi.org/10.1111/dmcn.13397"
}