1. Department of Obstetrics and Gynecology and Reproductive Sciences, University of California, San Francisco (UCSF), 50 Beale Street, Suite 1200, San Francisco, CA 94105, USA
2. Center for Microbiology Research, Kenya Medical Research Institute (KEMRI), Mbagathi Road, P.O. Box 19464, Nairobi 00202, Kenya
3. Ibis Reproductive Health, 17 Dunster Street, Suite 201, Cambridge, MA 02138, USA