1. Laboratory of Epidemiology and Population Sciences, National Institute on Aging, Intramural Research Program, NIA/NIH/IRP, Baltimore, MD 21224, USA
2. Department of Psychology, Clemson University, Clemson, SC 29634, USA
3. Department of Veterans Affairs, VA National Center on Homelessness Among Veterans, Washington, DC 20420, USA
4. Department of Management, Policy, and Community Health, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX 77030, USA