1. Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia.
2. Kenyatta National Hospital/University of Nairobi, Nairobi, Kenya.
3. CDC-Zambia, Lusaka, Zambia.
4. CDC-Kenya, Nairobi, Kenya.
5. University of Alabama at Birmingham, Birmingham, Alabama and the Centre for Infectious Disease Research in Zambia, Lusaka, Zambia.
6. Global AIDS Program, CDC, Atlanta, Georgia.