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Contributors Contributed by the BJSM team Education from other journals.
Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
Disclaimer Original image provided by paper author Monika Bayer
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.
Collaborators Education from other journals team.
Correction notice This article has been corrected since it was published Online First. A clarification about the original source of figure 1 has been added.