@article{ref1,
title="American Academy of Pediatrics. Committee on Sports Medicine and Committee on School Health: Organized athletics for preadolescent children",
journal="Pediatrics",
year="1989",
author="American Academy of Pediatrics, ",
volume="84",
number="3",
pages="583-584",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0031-4005",
doi="",
url="http://dx.doi.org/"
}