1. The Gerontology Institute, Georgia State University , Atlanta, Georgia , USA
2. Department of Sociology, Georgia State University , Atlanta, Georgia , USA
3. Division of Geriatrics & Gerontology, Department of Medicine, Emory School of Medicine , Atlanta, Georgia , USA
4. Department of Sociology, Emory University , Atlanta, Georgia , USA
5. Birmingham/Atlanta VA Geriatric Research, Education, and Clinical Center , Atlanta, Georgia , USA