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. 2018 Dec 13;18(Suppl 4):1317. doi: 10.1186/s12889-018-6189-8

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© The Author(s). 2018

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. 2 — Average time spent on supportive supervision for routine immunization (RI) and surveillance; supportive supervision data 2015–2016, Nigeria. NCZ north-central zone, NEZ northeast zone, NWZ northwest zone, SEZ southeast zone, SSZ south-south zone, SWZ southwest zone