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. 2019 Oct 15;19:695. doi: 10.1186/s12913-019-4540-0

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© The Author(s). 2019

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. 4 — Distribution of the usage rate. The histogram of the usage rate for the 136 Coopers is plotted, with the x-axis showing the usage count with bins representing 2% and the y-axis showing the number of instruments at each value of x