Received: 7 January 2020
Accepted: 8 June 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: The study was approved by the Ethical Commission of the University Hospital Frankfurt (Goethe University) and it was stated that no further approval was required. The study was conducted according to the Declaration of Helsinki. All participants of the study gave their written consent for participation, which they could withdraw at any time.
: Not applicable since no individual person’s data was included in the manuscript.
: All authors declare that they have no financial or non-financial competing interests that might create a conflict of interest with the information presented in this article. One of the authors (MR) is also a member of BMC Medical Education’s editorial board.