1. Department of Surgery, University of North Carolina at Chapel Hill, USA
2. Department of Epidemiology, University of North Carolina at Chapel Hill, USA
3. Division of Intramural Research, National Institute on Minority Health and Health Disparities (NIMHD), National Institutes of Health, Bethesda, Maryland, USA
4. Department of Burn Surgery, University of North Carolina at Chapel Hill, USA
5. Department of Surgery, Duke University, Durham, North Carolina, USA