1. Project RETRO-CI, 01 Abidjan, Ivory Coast and Division of HIV/AIDS Prevention, Surveillance, and Epidemiology, National Center for STD, HIV, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
2. Division of HIV/AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
3. Project RETRO-CI, 01 Abidjan, Ivory Coast and Institute of Tropical Medicine, B-2000 Antwerp, Belgium.
4. Project RETRO-CI, 01 Abidjan, Ivory Coast
5. Institute of Tropical Medicine, B-2000 Antwerp, Belgium