1. Center for Mental Healthcare and Outcomes Research, Central Arkansas Veterans Healthcare System, North Little Rock, Arkansas, USA.
2. South Central Mental Illness Research, Education and Clinical Center, Central Arkansas Veterans Healthcare System, North Little Rock, Arkansas, USA.
3. Division of Health Services Research, Department of Psychiatry, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
4. Office of Research and Development, Veterans Health Administration, Washington, District of Columbia, USA.
5. School of Public Health and Tropical Medicine, Tulane University, New Orleans, Louisiana, USA.
6. School of Medicine, Tulane University, New Orleans, Louisiana, USA.
7. Virtual Reality Medical Center, San Diego, California, USA.
8. Maryland Treatment Centers, Baltimore, Maryland, USA.