1. Overton Brooks VA Medical Center, Shreveport LA, USA
2. LSU Health Sciences Center, Shreveport LA, USA
3. Center for Neuroscience, UC Davis, Davis CA, USA
4. Department of Psychology, William Jessup University, Rocklin, CA, USA
5. VA Northern California Health Care System, Martinez CA, USA
6. Department of Neurology, UC Davis, Sacramento CA, USA