1. PPD, Part of Thermo Fisher Scientific, Wilmington, North Carolina, USA.
2. Patient Safety Monitoring in International Laboratories (pSMILE), Department of Pathology, Johns Hopkins University, Baltimore, Maryland, USA.
3. HIV Prevention Trials Network LC, Department of Pathology, Johns Hopkins University, Baltimore, Maryland, USA.
4. Westat, Rockville, Maryland, USA.
5. Department of Surgery and Center for AIDS Research, Duke University Medical Center, Durham, North Carolina, USA.
6. Infectious Diseases Institute (IDI) Core Lab, Kampala, Uganda.
7. The Aurum Institute, Johannesburg, South Africa.
8. Centre for the AIDS Programme of Research in South Africa (CAPRISA), Berea, South Africa.
9. International Maternal Pediatric Adolescent AIDS Clinical Trials and AIDS Clinical Trials Group, University of California, Los Angeles, California, USA.
10. HIV Vaccine Trials Network LC, Cape Town, South Africa.
11. HIV Vaccine Trials Network LC, Seattle, Washington, USA.
12. Kenya Medical Research Institute, Nairobi, Kenya.
13. HIV Netherlands Australia Thailand (HIV-NAT) AIDS Research Centre, Bangkok, Thailand.
14. Emory Infectious Diseases Clinic Research Laboratory, Decatur, Georgia.