1. Tropical Pesticides Research Institute, P.O. Box 3024, Arusha, Tanzania
2. School of Public Health and Social Sciences, Department of Environmental and Occupational Health, Muhimbili University of Health and Allied Sciences (MUHAS), P.O. Box 65015, Dar es Salaam, Tanzania
3. School of Public Health & Family Medicine, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory 7925, South Africa