Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (#01GY1606)
Received: 1 September 2020
Accepted: 31 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: The study was approved by the Ethics Commission of the Faculty of Medicine of Cologne University (#17–188). All participants gave verbal and written informed consent before taking part. All study participants received a detailed consent form explaining the purpose of the study. This form was sent as an attachment with the email, or printed copies of the consent form were personally given to the participants before data collection.
: This paper presents pseudonymized and summary data of all participants, hence consent to publish is not required.
: The authors declare that they have no competing interests.