1. Department of Psychiatry, School of Medicine, Uniformed Services University of the Health Sciences4301 Jones Bridge Road, Bethesda, MD 20814-4799, USA
2. Deployment Health Clinical Center, Walter Reed Army Medical CenterBuilding 2, Room 3G01 6900 Georgia Avenue, NW, Washington, DC 20307, USA
3. Office of Public Health and Environmental Hazards, Department of Veterans Affairs, VA Central Office (13A)810 Vermont Avenue, NW, Washington, DC 20420, USA
4. Directorate of Medical Policy, Canadian Forces Health Services1745 Alta Vista Drive, Ottawa, Ontario K1A 0K6, Canada