| Affiliation: | 1. Center for Aging and Population Health, Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania;2. Intramural Research Program, Laboratory of Epidemiology and Population Sciences, National Institute on Aging, Bethesda, Maryland;3. Intramural Research Program, National Institute on Aging, Baltimore, Maryland;4. Department of Physical Therapy, School of Health and Rehabilitation Science, University of Pittsburgh, Pittsburgh, Pennsylvania;5. Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, Tennessee;6. Department of Epidemiology and Biostatistics, University of California at San Francisco, San Francisco, California |
