1. Centers for Disease Control and Prevention, PO Box 1578, Kisumu, Kenya.
2. Ministry of Public Health and Sanitation, Nairobi, Kenya.
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, United States of America.
4. Center for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya.
5. Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya.