1. Department of Obstetrics, Gynecology and Reproductive Science, University of California San Francisco, San Francisco, CA, USA
2. Department of Clinical Microbiology and Infectious Diseases, School of Pathology, University of Witwatersrand, Wits Medical School, Johannesburg, South Africa
3. Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO, USA
4. Infection Control, Charlotte Maxeke Johannesburg Academic Hospital, National Health Laboratory Service, Johannesburg, South Africa