1. Disease Control Department, London School of Hygiene and Tropical Medicine, London, United Kingdom;
2. Centre for Social Research and Department of Political and Administrative Studies, University of Malawi Chancellor College, Zomba, Malawi;
3. International Centre for Evidence in Disability, London School of Hygiene and Tropical Medicine, London, United Kingdom
4. Department of Education and Teaching Studies, Mzuzu University, Mzuzu, Malawi;
5. Water Engineering and Development Centre, Loughborough University, Loughborough, United Kingdom;
6. Centre of Excellence in Water and Sanitation, Mzuzu University, Mzuzu, Malawi;