1. Department of Veterans Affairs, National Center on Homelessness Among Veterans, Washington, District of Columbia, USA.
2. VISN 6 Mental Illness Research, Education and Clinical Center (MIRECC), Durham, North Carolina, USA.
3. Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, North Carolina, USA.
4. Durham VA Health Care System, Durham, North Carolina, USA.
5. School of Public Health, University of Texas Health Science Center at Houston, Houston, Texas, USA.