1. Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Epidemic Intelligence Service, Division of Scientific Education and Professional Development, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Kentucky Department for Public Health, Frankfort, Kentucky, USA
4. Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
6. Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Australia