Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01PK1501A/B/C)
Text and Data Mining valid from 2020-01-07
Received: 23 September 2019
Accepted: 22 December 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The Ethics Committee of the Chamber of Physicians, Hamburg, confirmed the innocuousness of this study with consented, anonymized, and voluntary participation (PV3649). Written consent was obtained from all participants.
: Not applicable.
: SH is section editor and MK is associate editor to BMC Medical Education. SP, KS, FF, SF, VO and POB declare that they have no competing interests.