1. Environmental Health Group, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK
2. Ministry of Health, Community Development, Gender, Elderly and Children (MOHCDGEC former MOHSW), Dar es Salaam, Tanzania
3. National Institute for Medical Research (NIMR), Amani Research Centre, Ubwari, Muheza, Tanzania
4. Ministry of Education, Science and Technology (MoEST former MoEVT), Dar es Salaam, Tanzania