It is estimated that over 1,000,000 people in the United States are affected by Parkinson's disease (PD) with approximately 50,000 to 60,000 new cases diagnosed each year. PD is a neurodegenerative disorder with the cardinal symptoms of bradykinesia, rigidity and tremor as well as postural instability in the later stages of the disease. Treatment has traditionally focused on the motor symptoms; however, it has been increasingly recognized that non-motor...