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Except where otherwise noted, this item's license is described as This is an Open Access publication distributed under the terms of the Creative Commons Attribution Non-Commercial 4.0 International licence (CC BY-NC), which permits use, distribution and reproduction in any medium, provided the original authors and source are credited, any modifications or adaptations are indicated, and the work is not used for commercial purposes. http://creativecommons.org/licenses/by-nc/4.0/legalcode For any reuse or distribution, you must make clear to others the licence terms of this work. If you use the work, we ask that you reference the SLH website (https://sanitationlearninghub.org/) and send a copy of the work or a link to its use online to the following address: The Sanitation Learning Hub, Institute of Development Studies, University of Sussex, Brighton, BN1 9RE, UK (SLH@ids.ac.uk).