1. Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC
2. Injury Prevention Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
3. Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, NC
4. College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE
5. University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC.