| Affiliation: | 1. Department of Emergency Medicine, University of North Carolina, Chapel Hill, North Carolina;2. Center for Aging and Health, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;3. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;4. Department of Health Policy and Management, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;5. Howard W. Odum Institute for Research in Social Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina |
