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. 2017 May 12;2:5. doi: 10.1186/s41073-017-0031-1

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© The Author(s) 2017

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 — Annual number of retractions in cancer research publications. The number of retracted articles per year has rapidly increased. Due to the lag time between publication and retraction, only two retracted articles were identified in 2015 at the time of the literature search