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. 2017 Feb 18;17:155. doi: 10.1186/s12879-017-2248-5

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© The Author(s). 2017

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. 1 — Decision Tree Study Arms: Sample of decision tree displaying the two study arms, slightly modified: A scenario in which pregnant women are screened for chlamydia, and a scenario in which no screening program exists. Square: origin node; Circle: chance node; Triangle: terminal node