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Footnotes
MSS and TIC are Joint first authors.
Contributors The manuscript was written by MSS, TIC, OB and TJ. The figures were prepared and photographs taken by TJ. All authors have reviewed and agreed on the final manuscript.
Funding TJ and OB’s travel to Dhaka was supported by Global Challenge Research Funding.
Map disclaimer The depiction of boundaries on the map(s) in this article does not imply the expression of any opinion whatsoever on the part of BMJ (or any member of its group) concerning the legal status of any country, territory, jurisdiction or area or of its authorities. The map(s) are provided without any warranty of any kind, either express or implied.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned. Externally peer reviewed by Colin Mumford, Edinburgh, UK, and Hadi Manji, London, UK.