Received: 15 September 2020
Accepted: 9 November 2020
First Online: 12 January 2021
Ethics approval and consent to participate
: The study was performed in accordance with the Declaration of Helsinki and the Ethics Committee of the Chamber of Physicians, Hamburg, confirmed the innocuousness of the study with consented, anonymized, and voluntary participation (PV3649). All participants provided informed written consent for participation in this study.
: Not applicable.
: SH has a position as Section Editor to BMC Medical Education. EZ and VO have no competing interests.