1. Veterans Affairs (VA) Mid-Atlantic Mental Illness Research, Education and Clinical Center (MIRECC), Durham, North Carolina, USA
2. Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, North Carolina, USA
3. Department of Anesthesiology, University of North Carolina-Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
4. Department of Psychology, University of North Carolina-Wilmington, Wilmington, North Carolina, USA
5. Center for Applied Psychophysiology, East Carolina University, Greenville, North Carolina, USA