| Affiliation: | 2. Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, NC, USA;3. Health Services Research and Development Service, Durham Veterans Affairs Medical Center, Durham, NC, USA;4. Department of Medicine, Duke University Medical Center, Durham, NC, USA;5. Department of Radiology, University of North Carolina, Chapel Hill, NC, USA;11. Department of Medicine, University of North Carolina, Chapel Hill, NC, USA;12. Department of Orthopaedics, University of North Carolina, Chapel Hill, NC, USA |
