1. Department of Global Health University of Washington Seattle WA USA
2. Department of Epidemiology University of Washington Seattle WA USA
3. Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya
4. Partners in Health and Research Development Centre for Clinical Research Kenya Medical Research Institute Nairobi Kenya
5. Department of Medicine University of Washington Seattle WA USA
6. Center for Clinical Research Kenya Medical Research Institute Nairobi Kenya