1. Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel Street, London, WC1E 7HT, United Kingdom
2. Mehran University of Engineering and Technology, Jamshoro, Sindh 76062, Pakistan
3. Oxfam GB, Oxfam House, John Smith Drive, Oxford, OX4 2JY, United Kingdom
4. School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, United States