1. Department of Obstetrics and Gynecology Beth Israel Deaconess Medical Center Boston MA USA
2. Department of Obstetrics, Gynecology, and Reproductive Biology Harvard Medical School Boston MA USA
3. Division of Infectious Diseases Beth Israel Deaconess Medical Center Boston MA USA
4. Botswana‐Harvard Partnership Gaborone Botswana
5. Department of Obstetrics and Gynecology Faculty of Medicine, University of Botswana
6. Department of Immunology and Infectious Diseases Harvard T.H. Chan School of Public Health Boston MA USA