Received: 31 March 2020
Accepted: 15 July 2020
First Online: 5 August 2020
Ethics approval and consent to participate
: All procedures followed the Helsinki Declaration and all participants provided written informed consent. The ethics committee of the Canton of Zurich approved the study under BASEC 2016–00258. ExternalRef removed Identifier; NCT03160534.
: Not applicable.
: The authors declare that they have no competing interests.