1. Centre for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya
2. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California San Francisco, San Francisco, CA, USA
3. School of Medicine, University of Colorado, Denver, CO, USA
4. Department of Global Health, University of Washington, Seattle, WA, USA
5. Division of Global HIV/AIDS, U.S. Centers for Disease Control and Prevention, Nairobi, Kenya
6. Department of Pediatrics, University of Colorado, Aurora, CO, USA
7. University of British Columbia, Vancouver, Canada