1. Duke Clinical Research Institute , Durham, NC , USA
2. Department of Orthopaedic Surgery , Duke University School of Medicine, Durham, NC , USA
3. Duke-Margolis Center for Health Policy , Duke University, Durham, NC , USA
4. Center of Innovation to Accelerate Discovery and Practice Transformation , Durham VA Health Care System, Durham, NC , USA
5. Department of Biostatistics and Bioinformatics , Duke University Medical Center, Durham, NC , USA
6. Department of Population Health Sciences , Duke University School of Medicine, Durham, NC , USA
7. Division of Geriatrics , Duke University School of Medicine, Durham, NC , USA