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. 2020 Feb 14;10:2618. doi: 10.1038/s41598-020-58899-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Map of Burkina Faso with small administrative divisions nested to health-districts areas and Spatial pattern of estimated pregnancies per grid square. Black bold lines correspond to limits of the health-districts and gray lines in each health-district correspond to limits of communities. Maps created by Toussaint Rouamba et al., 2019. Source: The shapefile was obtained from the “Base Nationale de Découpage du territoire” of Burkina Faso (BNDT, 2006). The estimates of numbers of pregnancies per grid square were obtained from WorldPop (www.worldpop.org - School of Geography and Environmental Science, University of Southampton). The globe (name: orthographic map of Burkina Faso) used in this Figure is created by Martin23230 and freely available at https://commons.wikimedia.org/wiki/File:Burkina_Faso_(orthographic_projection).svg under CC BY-SA 3.0 License (https://creativecommons.org/licenses/by-sa/3.0/deed.en), which lets others remix, tweak, and build upon their work even for commercial purposes, as long as they credit author and license their new creations under the identical terms.