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. 2016 Feb 3;16:10. doi: 10.1186/s12873-016-0074-5

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© Jin et al. 2016

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 — Prospective cohort construction. The final cohort includes 193,886 ED encounters between Jan 1, 2013 and Jun 30, 2013. 105 encounters associated with patients who have died were excluded from the database