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. 2017 Jun 9;17:149. doi: 10.1186/s12872-017-0592-4

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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. 1 — Box-and-whisker plot of hospital variation in extent of decline in nonacute PCIs from 2007 to 2012 in Taiwan by region (size of the circle indicates the volume of PCIs performed in each hospital in 2012)