1. Department of NeurologyLSU Health Sciences Center, Shreveport, LA, USA
2. Department of AnesthesiologyLSU Health Sciences Center, Shreveport, LA, USA
3. Sina MS Research Center, Brain and Spinal Injury Research Center, Tehran University of Medical Sciences, Tehran, Iran
4. Overton Brooks VA Medical CenterShreveport, LA, USA
5. Department of AnesthesiologyEmory University, Atlanta, GA, USA