1. South African Field Epidemiology Training Programme, National Institute for Communicable Diseases, Johannesburg, South Africa
2. Epidemiology Research Unit, Foundation for Professional Development, Pretoria, South Africa
3. School of Health System and Public Health, University of Pretoria, Pretoria, South Africa
4. Department of Health, Eden District, Western Cape Province, George, South Africa
5. US Centers for Disease Control and Prevention, Pretoria, South Africa
6. Division of Global Health Protection, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, USA