1 Wellcome Trust Centre for Global Health Research, Brighton and Sussex Medical School, Brighton, BN1 9PX, UK; School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia. Electronic address: kebededeka@yahoo.com.
2 Federal Ministry of Health, Addis Ababa, Ethiopia.
3 Malaria and Other Parasitic Diseases Division, Rwanda Biomedical Center, Kigali, Rwanda.
4 Wellcome Trust Centre for Global Health Research, Brighton and Sussex Medical School, Brighton, BN1 9PX, UK; School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia.