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. 2019 Apr 12;8(8):e011402. doi: 10.1161/JAHA.118.011402

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© 2019 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Distribution of hospital annual case volumes from 2006 (red), 2010 (green), and 2014 (blue). *As histograms giving absolute number of hospitals by volume were prohibited because of the data protection law, kernel‐density plots were used for approximation. °Cumulative density indicates the share of hospitals having an annual case volume equal to or less than indicated on the x axis. For example, in 2006, ≈65% of hospitals operated on ≤20 type A aortic dissection cases, whereas in 2014, this share decreased to 44%.