@article{ref1,
title="The epidemiology of mental handicap",
journal="Developmental medicine and child neurology",
year="1973",
author="Kushlick, A. and Cox, G. R.",
volume="15",
number="6",
pages="748-759",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0012-1622",
doi="",
url="http://dx.doi.org/"
}