Affiliation: | 1. Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;2. Department of Obstetrics and Gynecology, Chris Hani Baragwanath Hospital, Soweto, South Africa;3. Department of Obstetrics and Gynecology, King Edward Hospital, Durban, South Africa;4. South African National Blood Service, Johannesburg, South Africa South African Bone Marrow Registry, Cape Town, South Africa;5. Cryo-Save, Pretoria, South Africa;6. Department of Obstetrics and Gynecology, Mowbray Maternity Hospital, Cape Town, South Africa Department of Obstetrics and Gynecology, Groote Schuur Hospital, Cape Town, South Africa;7. Department of Obstetrics and Gynecology, Groote Schuur Hospital, Cape Town, South Africa;8. RTI International, Rockville, Maryland;9. Kaiser Permanente Northern California Division of Research, Oakland, California;10. Vitalant Research Institute, San Francisco, California;11. Department of Epidemiology & Biostatistics, University of California San Francisco, San Francisco, California;12. Vitalant Research Institute, San Francisco, California Department of Laboratory Medicine, University of California San Francisco, San Francisco, California Department of Epidemiology & Biostatistics, University of California San Francisco, San Francisco, California |