1. Center for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya
2. department of Obs-Gyn, University of Washington, Seattle, WA
3. Department of Epidemiology, University of California, Los Angeles, CA, USA
4. International Training and Education Center for Health (I-TECH), University of Washington, Seattle, WA, USA
5. Department of Global Health, University of Washington, Seattle, WA, USA