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. 2018 Sep 7;16:138. doi: 10.1186/s12916-018-1132-5

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© The Author(s). 2018

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 — Distribution of burst lengths in original data and in bootstrapped surrogate data (250 iterations): (a) Primary Care Out of Hours (PCOOH) data with time window Δt = 7 days; (b) Emergency Department (ED) data with Δt = 7 days; (c) PCOOH data with Δt = 4 days; and (d) ED data with Δt = 10 days