1. Durham VA Health Care System, Durham, North Carolina, USA
2. VA Mid-Atlantic Mental Illness Research, Education and Clinical Center, Durham, North Carolina, USA
3. School of Public Health, University of Texas Health Science Center at Houston, Houston, Texas, USA
4. VA National Center on Homelessness Among Veterans, Tampa, Florida, USA
5. Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, North Carolina, USA