@article{ref1,
title="A nationwide population study of severe head injury and Parkinson's disease",
journal="Parkinsonism and related disorders",
year="2009",
author="Spangenberg, Soren and Hannerz, Harald and Tuchsen, Finn and Mikkelsen, Kim Lyngby",
volume="15",
number="1",
pages="12-14",
abstract="The aim was to analyze prospectively the association between severe head injury and Parkinson's disease. All people in Denmark who were at least 20 years old as on 1 January 1981 were followed for hospitalisation due to previous head trauma during 1981-1993 and for hospital contacts due to PD during 1995-2004. We observed 107 cases of PD among people at hypothetical risk due to previous head injury. The expected number was 112.1, which yielded a standardised morbidity ratio of 0.954 (95% CI: 0.782-1.15). The study provides no support for severe head injury among adults being a risk factor for Parkinson's disease.<p>Language: en</p>",
language="en",
issn="1353-8020",
doi="10.1016/j.parkreldis.2008.02.004",
url="http://dx.doi.org/10.1016/j.parkreldis.2008.02.004"
}