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. 2015 Aug 6;15:57. doi: 10.1186/s12905-015-0216-z

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© Tancredi et al. 2015

Open Access This 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. 2 — Definition of intervals for use in electronic medical record abstraction. To match the reporting periods spanned by the T1, T2 and T3 surveys, events identified in electronic medical record (EMR) data are assigned to patient-specific intervals using the displayed definitions