Risk of Parkinson's disease among first-degree relatives: A community-based study.


OBJECTIVE To determine the relative risk (RR) and cumulative incidence of idiopathic Parkinson's disease (PD) in first-degree relatives of PD patients compared with relatives of controls from the same geographic region. DESIGN A family history questionnaire was used to obtain information on all first-degree relatives of cases and controls. A subset of… (More)


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