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. 2016 Jun 2;5:45. doi: 10.1186/s40249-016-0139-4

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© Rao et al. 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. 3 — Monthly incidence rates of TB in Qinghai Province, China, from January 2009 to December 2013. The TB incidence rate showed significant periodicity and seasonality, reaching a seasonal peak around April and decreasing to a trough in December. TB, tuberculosis