1. Department of Physiological Sciences, University of Florida, Gainesville, Florida, USA.
2. BRRC, North Florida/South Georgia Veterans Health System, Gainesville, Florida, USA.
3. Research Service, North Florida/South Georgia Veterans Health System, Gainesville, Florida, USA.
4. Department of Neuroscience, University of Florida, Gainesville, Florida, USA.
5. Department of Anesthesiology, University of Florida, Gainesville, Florida, USA.
6. Department of Neurology, University of Florida, Gainesville, Florida, USA.