| Affiliation: | 1. Department of Biostatistics, University of North Carolina Chapel Hill, , Chapel Hill, NC;2. Division of General Medicine and Clinical Epidemiology, University of North Carolina Chapel Hill, , Chapel Hill, NC;3. School of Medicine, University of North Carolina Chapel Hill, , Chapel Hill, NC;4. Department of Anesthesiology, University of North Carolina Chapel Hill, , Chapel Hill, NC;5. College of Dentistry, University of Florida, , Gainesville, FL;6. Department of Family Medicine, University of North Carolina Chapel Hill, , Chapel Hill, NC;7. Department of Emergency Medicine, University of North Carolina Chapel Hill, , Chapel Hill, NC |
