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. 2019 Oct 3;11:21. doi: 10.1186/s13089-019-0137-4

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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.

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Fig. 1 — Number of learners reaching the study aims. From left to the right, the figure depicts the number of learners that: (1) correctly detected both acoustic windows and performed accurate measurements (first outcome); (2) correctly identified the subcostal view; (3) correctly identified the apposition zone; (4) accurately performed the DD measurement; and (5) accurately performed the TF measurement. White bars represent the intervention group while grey ones the control group. The dashed line represents the total number of learners randomized per group (n = 86)