1. Department of Medicine, Duke University Health System, Durham, North Carolina
2. Health Services Research and Development Center of Innovation, Durham VA Health Care System, Durham, North Carolina
3. Department of Health Policy and Management, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
4. Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
5. Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, North Carolina