1. Department of Neurology, Geffen University of California Los Angeles School of Medicine, Los Angeles, CA
2. Department of Neurology, College of Medicine, University of Florida, Gainesville, FL
3. Department of Physical Therapy, University of Louisville, Louisville, KY
4. Department of Biostatistics, University of Florida, Gainesville, FL
5. Research Service, Malcolm Randall Department of Veterans Affairs (VA) Medical Center, Gainesville, FLDepartment of Physical Therapy, University of Florida, Gainesville, FL
6. Department of Health Science and Division of Physical Therapy, Medical University of South Carolina, and Ralph H. Johnson VA Medical Center, Charleston, SC
7. Department of Internal Medicine, University of Pittsburgh and Geriatric Research Education and Clinical Centers, VA Pittsburgh Health System, Pittsburgh, PA
8. Department of Neurology, Wake Forest University, Winston-Salem, NC