@article{ref1,
title="The gross motor function classification system: an update on impact and clinical utility",
journal="Pediatric physical therapy",
year="2010",
author="Michaels, Margaret Barry and Bossola, Kelly",
volume="22",
number="3",
pages="321-321",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0898-5669",
doi="10.1097/PEP.0b013e3181eb6f15",
url="http://dx.doi.org/10.1097/PEP.0b013e3181eb6f15"
}