1. Department of Management, Policy & Community Health, University of Texas Health Science Center at Houston, Houston, TX, USA
2. SEARCH Homeless Services, Houston, TX, USA
3. Department of Psychiatry and Behavioral Health, University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, USA
4. Center for Neurobehavioral Research on Addiction, Houston, TX, USA
5. Healthcare for the Homeless–Houston, Houston, TX, USA