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. 2018 Nov 9;363:k1614. doi: 10.1136/bmj.k1614

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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Fig 2 — Example of a diagram of a stepped wedge cluster randomised trial (SW-CRT) from the Riverbank Filtration Trial. Adapted from figure 2 in McGuinness SL, O’Toole JE, Boving TB, et al. Protocol for a cluster randomised stepped wedge trial assessing the impact of a community-level hygiene intervention and a water intervention using riverbank filtration technology on diarrhoeal prevalence in India. BMJ Open 2017;7:e015036. doi:10.1136/bmjopen-2016-015036. PubMed PMID:28314746; PubMed Central PMCID:PMC5372111.