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. 2016 May 12;15:277. doi: 10.1186/s12936-016-1320-8

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Map of the study sites. Circles depict the 12 sentinel sites at which enrolment was conducted over the full duration of the study (old Site). Squares depict the additional 23 sites from which enrolment was started eight months into the study (new Site)