1. Department of Environmental Health, and
2. Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA
3. Faculty of Infectious Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
4. School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
5. Aquaya Institute, Nairobi, Kenya