Received: 4 July 2019
Accepted: 7 May 2020
First Online: 18 May 2020
Ethics approval and consent to participate
: Ethical committee approval was granted by the General Medical Council of Hamburg, Germany (reference number: PV5122). All study participants provided written informed consent for study participation, data analysis, and publication.
: Not applicable.
: The authors declare that they have no competing interests.