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. 2020 Jan 13;20:50. doi: 10.1186/s12889-020-8161-7

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© The Author(s). 2020

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. 2 — Pass-rates for the BLS-exam and on item level. In the panels at the top the results of the male and at the bottom the results of the female participants are presented. Panels on the left show results immediately after training and on the right nine months later