1. Department of Neurology, University of Virginia School of Medicine, Charlottesville, VA, USA
2. Department of Neurology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
3. Department of Neurosurgery, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
4. The Southeast Parkinson’s Disease Research, Education, and Care Center, Hunter Holmes McGuire Veteran Affairs Medical Center, Richmond, VA, USA