Funding for this research was provided by:
Received: 5 January 2021
Accepted: 22 July 2021
First Online: 14 August 2021
: The study was approved by the competent Cantonal Ethics Committee (CEC) of Zurich (KEK-ZH 2017–00363). All subjects or their legal representatives gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.