Affiliation: | a The Bill and Berniece Grewcock Center for Conservation and Research, Omaha, Nebraska b Department of Obstetrics and Gynaecology, University of Pretoria, Pretoria Academic Hospital, Gauteng, South Africa c Department of Obstetrics and Gynecology, Mayo Clinic, College of Medicine, Rochester, Minnesota d National Institute for Communicable Diseases, Johannesburg, Gauteng, South Africa e Lancet Laboratories, Johannesburg, Gauteng, South Africa |