1. Zambia National Public Health Institute, Lusaka, Zambia;
2. Ministry of Health, Lusaka, Zambia;
3. Zambia Field Epidemiology Training Program, Lusaka, Zambia;
4. U.S. Centers for Disease Control and Prevention, Atlanta, Georgia;
5. U.S. Centers for Disease Control and Prevention, Lusaka, Zambia;
6. School of Medicine, Copperbelt University, Lusaka, Zambia