@article{ref1,
title="Variations in pediatric hospitalization rates: why do they occur?",
journal="Pediatric annals",
year="1994",
author="Perrin, J. M.",
volume="23",
number="12",
pages="676-7, 681",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-4481",
doi="",
url="http://dx.doi.org/"
}