1. W. G. (Bill) Hefner VA Healthcare System, Research and Academic Affairs, Salisbury, North Carolina, USA.
2. Mid-Atlantic Mental Illness Research Education and Clinical Center, Durham, North Carolina, USA.
3. Department of Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA.
4. Department of Neurology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA.
5. Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA.
6. Division of Biomedical Sciences, Edward Via College of Osteopathic Medicine, Blacksburg, Virginia, USA.