@article{ref1,
title="Physical activity measurement in children",
journal="Australian and New Zealand journal of public health",
year="1998",
author="Batty, D.",
volume="22",
number="1",
pages="165-165",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1326-0200",
doi="",
url="http://dx.doi.org/"
}