Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (ID 03ZZ0804 A-C)
Received: 20 December 2019
Accepted: 10 February 2021
First Online: 6 April 2021
Ethics approval and consent to participate
: The review boards of the institutions involved approved all study procedures: the institutions involved are Jena University Hospital (4742-03/16), Charité—University Medicine Berlin (AZ150/16) and Medical Chamber Brandenburg (AS 55(bB)/2016). All participants received a brief explanation of the aims of the questionnaire survey, that participation was voluntary and that data analysis would be anonymous. Since no personal data such as signatures were assessed, the return of the questionnaire was considered as consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.