1. Department of Sociology, Anthropology, and Health Administration and Policy, University of Maryland, Baltimore County , Baltimore, Maryland , USA
2. Gerontology Doctoral Program, University of Maryland, Baltimore , Baltimore, Maryland , USA
3. Department of Sociology & Gerontology, Miami University , Oxford, Ohio , USA
4. RAND Corporation , Santa Monica, California , USA
5. Scripps Gerontology Center, Miami University , Oxford, Ohio , USA
6. Department of Educational Technology, Research and Assessment, Northern Illinois University , DeKalb, Illinois , USA