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. 2021 Nov 26;6(11):e006920. doi: 10.1136/bmjgh-2021-006920

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Map showing study settings and population density in Malawi, Uganda and Zimbabwe. Maps were generated using ESRI ArcMap 10.8.1 (ESRI 2020; Redlands, California, USA). Population data were sourced from www.worldpop.org and consists of 2020 population estimates for each country at the scale of 100 m² grid cells.

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