Funding for this research was provided by:
Received: 13 January 2020
Accepted: 4 March 2021
First Online: 16 April 2021
: The Ethics Committee of the University of Zurich, Switzerland, formally approved the research protocol, which was conducted in accordance with the principles of the Declaration of Helsinki. All participants provided written informed consent before participating in the study.
: Not applicable.
: The authors declare that they have no competing interests.