1. From the Department of Anesthesiology (D.J.D., R.M.B.), Baylor College of Medicine, Houston, TX
2. Department of Molecular Physiology and Biophysics (D.J.D., R.M.B.), Baylor College of Medicine, Houston, TX
3. Department of Neurology, McGovern Medical School at The University of Texas Health Science Center, Houston (J.L., L.D.M.).