1. The Translational Research Center for TBI and Stress Disorders (TRACTS), Veterans Affairs Boston Healthcare System, Boston, MA, USA
2. Department of Kinesiology and Community Health, University of Illinois at Urbana Champaign, Champaign, IL, USA
3. Department of Social, Behavioral, and Population Sciences, Tulane School of Public Health & Tropical Medicine, New Orleans, LA, USA
4. Geriatric Research, Education and Clinical Center, Veterans Affairs Durham Healthcare System, Durham, NC, USA
5. Department of Medicine, Duke University, Durham, NC, USA