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Article History

Received: 3 January 2019

Accepted: 8 April 2019

First Online: 2 May 2019

Ethics approval and consent to participate

: The ethical review board of the Netherlands Association for Medical Education approved this study (dossier number 1068). The need for informed consent was waived.

: Consent for publication was not acquired since the images in this manuscript are entirely unidentifiable and there are no details on individuals reported in the manuscript.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.