Changes over time in the incidence of parkinsonism and Parkinson disease (PD) remain uncertain.
To investigate secular trends (period effects) and birth cohort trends in the incidence of parkinsonism and PD over 30 years in a geographically defined American population.
Design, Setting, and Participants...
JAMA Neurol. Published online June 20, 2016. doi:10.1001/jamaneurol.2016.0947