@article{ref1,
title="How dangerous are performance and competitive sports?",
journal="Munchener Medizinische Wochenschrift",
year="1971",
author="Groh, H.",
volume="113",
number="11",
pages="380-383",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0027-2973",
doi="",
url="http://dx.doi.org/"
}