Parkinson's disease (PD) is the second most common neurodegenerative disorder in humans after Alzheimer's disease. It has been estimated that approximately 1,000,000 persons are currently diagnosed with PD in the United States and approximately 50,000 new cases are diagnosed each year. Symptoms can present in a variety of ways which may not be initially attributed to PD. In fact, many patients may see several doctors and receive several different...