Narayanan, AFarmer, EAGreco, MJ2020-09-102020-09-1020192019BMC Medical Education, 19, 73 (2019). https://doi.org/10.1186/s12909-019-1490-51472-69201472-6920https://hdl.handle.net/10292/13647Following publication of the original article [1], the author reported that Fig. 4 was missing. This has now been corrected in the original article.© The Author(s). 2019 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.Journal ArticleOpenAccess10.1186/s12909-019-1490-5