1 Departments of Anesthesiology, Biomedical Informatics, Physiology & Pharmacology, and Public Health Sciences, Wake Forest University School of Medicine, Winston Salem, NC, 27157.
2 National Institutes of Health, National Institutes of Neurological Disorders and Stroke, Bethesda, MD, 20824.
3 University of Texas at Dallas, Department of Neuroscience, Center for Advanced Pain Studies, Richardson, TX, 75080.