| Affiliation: | 1. Department of Medicine, John H. Stroger, Jr. Hospital of Cook County, , Chicago, Illinois;2. Division of Epidemiology and Community Health, School of Public Health, , Minneapolis, Minnesota;3. Department of Medicine, University of Minnesota, , Minneapolis, Minnesota;4. Center for Chronic Disease Outcomes Research, Veterans Affairs Medical Center, , Minneapolis, Minnesota;5. Department of Orthopaedics and Rehabilitation, Oregon Health & Science University, , Portland, Oregon;6. Geriatric Research Education and Clinical Center, Veterans Affairs Medical Center, , Minneapolis, Minnesota |
