1. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
2. Robert N. Butler Columbia Aging Center, Mailman School of Public Health, Columbia University, New York, New York
3. Department of Psychology, College of Humanities and Social Sciences, North Carolina State University, Raleigh
4. Carolina Population Center, University of North Carolina at Chapel Hill
5. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill
6. Department of Sociology, University of Texas at Austin
7. Department of Sociology, University of North Carolina at Chapel Hill