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To address the question of whether Parkinson's disease (PD) is a genetic or an environmental disorder; (i) we modeled the hazard of PD using two-parameter hazard functions; and (ii) we investigated whether the hazard rate of index cases depended on the age of symptom onset in the affected parent (genetic model) or depended on the age of the index case at the time the affected parent developed PD (environmental...
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