Funding for this research was provided by:
Received: 11 November 2020
Accepted: 28 May 2021
First Online: 2 August 2021
: Methods were carried out in accordance to the World Medical Association Declaration of Helsinki [CitationRef removed] and the European Data Protection Law [CitationRef removed]. Study protocols, instruments and consent documents were approved by the data-protection supervisor and head of ethics committee of the University of Augsburg. He excluded ethical concerns of any kind (negative clearance certificate 4th October, 2019). Only participants who gave an informed consent by a paper-agreement were included in the study.
: Not applicable.
: The authors declare that they have no competing interests.