1. Department of Epidemiology and North Carolina Center for Public Health Preparedness, North Carolina Institute for Public Health, The University of North Carolina School of Public Health, Chapel Hill, NC
2. General Communicable Disease Control Branch, Epidemiology Section, North Carolina Division of Public Health, North Carolina Department of Health and Human Services, Raleigh, NC
3. North Carolina Center for Public Health Preparedness, North Carolina Institute for Public Health, The University of North Carolina School of Public Health, Chapel Hill, NC
4. North Carolina Institute for Public Health, The University of North Carolina School of Public Health, Chapel Hill, NC