Parkinson's disease (PD) is the second most common neurodegenerative condition, with over a million people in the United States affected and 50,000-60,000 new cases diagnosed each year. The cause is unknown and there is currently no cure. It is not uncommon to mistake parkinsonian signs, such as tremor, bradykinesia, rigidity, and postural instability, as symptoms of PD, especially early in the disease course. A patient with PD may receive several...